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Scientists Finally Solved a 620-Mile Geological Mystery Hidden Beneath Alaska

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Scientists Finally Solved a 620-Mile Geological Mystery Hidden Beneath Alaska


For decades, geologists have been puzzled by the Denali Fault, a sprawling 620-mile geological feature in Alaska. This massive strike-slip fault system, where tectonic plates slide past each other horizontally, has long hinted at a deeper story—one that shaped North America’s western edge over millions of years. Recent research has finally uncovered the truth behind this mysterious fault, revealing that three distant geological sites, once thought to be separate, were part of a unified suture zone that fused two ancient landmasses into the North American plate.

Led by Sean Regan of the University of Alaska Fairbanks, this study provides groundbreaking insights into the tectonic forces that tore these regions apart over time. Using cutting-edge analysis and a wealth of geological evidence, the team has pieced together a story of massive tectonic shifts, inverted metamorphism, and the power of Earth’s dynamic crust.

A Unified Geological History Revealed

The Denali Fault spans over 1,200 miles, cutting across Alaska and Canada’s Yukon Territory. Its geological complexity has made it a focal point for scientists seeking to understand the processes that shaped North America’s lithosphere. However, the mystery of three specific sites—Clearwater Mountains in Alaska, Kluane Lake in the Yukon, and the Coast Mountains near Juneau—remained unsolved. Were these regions formed independently, or did they share a common origin?

Sean Regan and his team’s research revealed that these sites were once part of a single terminal suture zone, the location where two tectonic plates collided and fused together. This zone, formed between 72 and 56 million years ago, marked the final integration of the Wrangellia Composite Terrane—an ancient oceanic plate—into North America. Over millions of years, tectonic forces caused horizontal movement along the fault, tearing the suture zone apart and scattering its fragments across hundreds of miles.

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“Our understanding of lithospheric growth along the western margin of North America is becoming clearer,” Regan explained. “A big part of that is related to reconstructing strike-slip faults such as the Denali Fault.”

The Map Above Shows The Tectonic Plates That Influence Alaska’s Southeastern Fault Systems.
The map above shows the tectonic plates that influence Alaska’s southeastern fault systems. The Pacific Plate is actively subducting (sliding under) the North American Plate at a rate of about 2 inches per year. The Yakutat block (labeled YAK) prevents the Pacific Plate from subducting smoothly, causing the Wrangell Subplate to break off the North American Plate and rotate counterclockwise. The Denali and Totschunda Faults are located along the northeastern edge of the Wrangell Subplate. Image courtesy of the USGS

The Key Role of Inverted Metamorphism

One of the most striking pieces of evidence connecting these sites is the phenomenon of inverted metamorphism. Typically, rocks formed under higher temperatures and pressures are found deeper in the Earth’s crust, while those formed under lower conditions are closer to the surface. However, in these regions, the order is reversed—rocks formed at greater depths are found above those formed under less extreme conditions.

Regan noted: “We showed that each of these three independent inverted metamorphic belts formed at the same time under similar conditions. Not only are they the same age, but they all behaved in a similar fashion.”

By analyzing monazite, a mineral rich in rare earth elements, Regan’s team traced the geological evolution of rocks at each site. Monazite’s unique properties allowed the researchers to track changes in temperature and pressure over time, further confirming the shared history of these regions.

The Denali Fault’s Impact on North America

The Denali Fault’s significance extends beyond its geological intricacies. As a major strike-slip fault, it remains active and capable of generating powerful earthquakes. Understanding its history provides critical insights into the tectonic forces that continue to shape Alaska’s landscape today.

The fault also serves as a natural laboratory for studying plate tectonics. Its role in the accretion of the Wrangellia Composite Terrane illustrates the processes by which distant landmasses are integrated into larger continental plates. These insights are invaluable for reconstructing Earth’s tectonic history and understanding how continents evolve over time.

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Decades in the Making

This breakthrough builds on decades of geological research. A 1993 study by scientists at the University of Alberta and the University of British Columbia first suggested similarities between the Denali Fault sites but stopped short of identifying them as a unified structure.

“It was amazing to me that the 1993 paper hadn’t caught more attention back in the day,” Regan remarked. “I had this paper hung up on my wall for the last four years because I thought it was really ahead of its time.”

Regan’s work combines modern techniques with earlier observations to provide a more complete picture of the fault’s history. By piecing together data from multiple regions, the team has connected the dots to reveal the larger tectonic story.

Implications for Geological Science

The Denali Fault study has significant implications for our understanding of plate tectonics and lithospheric growth. By identifying the suture zone that joined the Wrangellia Composite Terrane to North America, the research sheds light on the processes that create and reshape continents.

This work also underscores the importance of collaboration and interdisciplinary research in solving complex geological puzzles. By integrating field observations, mineral analysis, and tectonic reconstructions, Regan and his team have provided a model for studying other fault systems around the world.

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“The dots don’t really get connected until you can reconstruct deformation on the Denali Fault,” Regan explained. This study serves as a reminder of the dynamic nature of Earth’s crust and the immense forces at work beneath our feet.

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Alaska is reporting 18 in-custody deaths so far this year, tying a grim record

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Alaska is reporting 18 in-custody deaths so far this year, tying a grim record


Barbed wire fencing surrounds Goose Creek Correctional Center on Tuesday, Aug. 29, 2023 outside of Wasilla. (Loren Holmes / ADN)

The Department of Corrections this week reported the 18th death of an inmate this year, tying the record for the highest number of annual in-custody deaths in at least the past decade.

Kane William Huff, who had been imprisoned at Goose Creek Correctional Center near Wasilla, died Dec. 11, according to a DOC statement. Huff, 46, was serving a sentence for a 2018 conviction on two counts of sexual abuse of a minor, according to online court records. DOC officials said he had been in custody since 2015.

Huff was found unresponsive in the prison’s infirmary, where he had been housed, said Department of Public Safety spokesman Austin McDaniel. Alaska State Troopers, who handle in-custody death investigations, have closed their investigation and are awaiting autopsy results from the State Medical Examiner Office, McDaniel said. Troopers don’t believe Huff died by suicide or that foul play was involved, he said.

The last time as many people died in state custody was in 2022, when a record seven inmates also died by suicide, according to a department snapshot of deaths since 2015.

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The Department of Corrections began consistently keeping inmate death statistics in 2001, said spokesperson Betsy Holley. The department also posts data showing in-custody deaths since 2015. That year, 15 people died while in DOC custody.

The state’s official count for 2025 doesn’t include the death of 36-year-old William Farmer, who died in a hospital in January after he was severely beaten by his cellmate at the Anchorage Correctional Complex the month before.

An upward trend of in-custody deaths in the past several years has alarmed some prisoner rights advocates and prompted state lawmakers to ask Department of Corrections officials to address the deaths in multiple hearings this year. The department has also found itself under fire for inmate suicides.

This year, at least four inmates have died of natural or expected causes, such as disease or a medical event, while at least five have died by suicide, according to information provided by Alaska State Troopers.

Officials have also said that a Spring Creek Correctional Center prisoner died of an overdose in April.

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Another inmate, 53-year-old Jeffrey Foreman, died in July after being restrained by guards after an altercation with his cellmate at the Anchorage Correctional Complex.

[Correction: An earlier version of this story incorrectly described the year the Department of Corrections started consistently keeping inmate death statistics. It was 2001, not 2015.]





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Hawaiian, Alaska airlines to use locally made biofuel | Honolulu Star-Advertiser

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LNG pipeline legislation debate divides Alaska lawmakers after consultant calls it ‘essential’

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LNG pipeline legislation debate divides Alaska lawmakers after consultant calls it ‘essential’


ANCHORAGE, Alaska (KTUU) Alaska lawmakers are divided over whether new legislation is needed for a liquified natural gas pipeline, with the state’s energy consultant calling it “essential” while some legislators say existing laws are sufficient.

“A successful project will likely require suitable enabling legislation from the state legislature, among other key prerequisites,” state-contracted energy consulting firm GaffneyCline, hired by the Legislative Budget and Audit Committee for up to $200,000 in April 2024, says in a document made public for the first time Monday.

The 62-page document, presented to the Legislative Budget and Audit Committee last month, concludes that legislation is essential for the pipeline to be viable but more needs to be done to get the project across the finish line.

“A detailed economic model of the project is required before the legislature can take an informed view as to the appropriate degree of government take that the project can sustain, and how this could evolve over time,” the document states.

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Alaska’s News Source reached out to Glenfarne Tuesday for comment on who presents the economic model and when that model could be presented. Spokesperson Tim Fitzpatrick referred on the report for GaffneyCline.

“We will continue to work closely with the legislature to discuss policy issues that may affect Alaska LNG and work collaboratively on solutions that enable Glenfarne to provide Alaskans with affordable energy security as rapidly as possible,” he said in a statement.

The document’s release comes amid optimism from pipeline developers and federal officials but growing skepticism from some state lawmakers.

During a November Legislative Budget and Audit Committee which discussed the same topic, House Speaker Bryce Edgmon, NA-Dillingham, left believing “the upcoming 2026 legislative session could be dominated by policy measures related to advancing the Alaska gas line project.”

“We don’t have any of this,” Edgmon said last month, relating to laws GaffneyCline says are essential.

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Rep. Mia Costello, R-Anchorage, former House minority leader and co-chair of the Alaska Gasline Caucus, said she believes legislation for the pipeline is not needed, citing previous legislative involvement.

“Large scale LNG projects around the world are successfully developed through commercial agreements, private capital, and existing regulatory processes not legislative intervention,” Costello said in a statement. “Alaska already has established permitting, taxation, and regulatory framework capable of supporting energy development. Legislative involvement risks introducing political uncertainty, delaying timelines, and discouraging investors who prioritize stability and market driven decision-making.”

However, Sen. Elvi Gray-Jackson, D-Anchorage, told Alaska’s News Source the policy measures currently in place are more than a decade old, created for a different project, and don’t easily mesh with the task in front of them today.

“When project leadership … and financial models change, it’s our responsibility to revisit the policy framework that governs the state involvement, and that’s what we’re going to do as a legislature,” Gray-Jackson said.

Legislative action?

The asks pipeline developers want in those policies could be steep.

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On the list of asks is a concept called “fiscal stability,” essentially a promise if Alaska changes its tax or regulatory policies later, the state would make up any financial losses to investors, according to a GaffneyCline presentation shown to lawmakers on the Legislative Budget and Audit Committee.

Those guarantees can mean a “tax freeze” — locking in the current tax system for the life of the project — potentially 20-30 years, according to GaffneyCline’s presentation to lawmakers. If Alaska later raises taxes or imposes new regulations, the presentation said the state would have to compensate investors to maintain their original profit expectations.

Another ask is the lowering of property taxes for the pipeline, something GaffneyCline’s November presentation said could cost the project $1 billion and add 9% to the cost of delivered gas.

Gov. Mike Dunleavy plans to introduce a bill to lower property taxes for the pipeline, spokesperson Jeff Turner confirmed Tuesday. No other LNG bills are planned at this time, he added.

Time crunch

Whatever the legislature decides to do, they’ll need to do it quickly. The regular session convenes Jan. 20, and for the following 120 days, the process to create a package of policies and framework addressing LNG issues will likely be front of mind.

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That comes after Glenfarne Alaska LNG set expectations in October that construction for the pipeline will begin in late 2026 and be operational by mid-2029.

“What Alaskans should take away from the report is that we need to hope for the best, but prepare for the situation not moving as fast as Glenfarne and the other players are thinking,” Gray-Jackson said.

Lawmakers have signaled a mixture of optimism for what the pipeline could create, but it comes with skepticism, too. Gray-Jackson said she was “cautiously optimistic.”

“Frankly, I don’t know where we’re at as far as the legislature is concerned because we haven’t gotten any real answers from Glenfarne,” Gray-Jackson said.

A Glenfarne spokesperson said last month they are active in providing information to the state legislature.

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“Glenfarne is making rapid progress on Alaska LNG and regularly meets with legislators to provide updates and discuss important state and local policy considerations,” Glenfarne communications director Tim Fitzpatrick said. “We appreciate the legislature’s continued engagement to help make Alaska LNG a success for the state.”

“I understand the potential, huge, multi-generational impact of the state, as well as being very positive,” Sen. Bert Stedman, R-Sitka, told Alaska’s News Source following the Legislative Budget and Audit Committee meeting in November.

“Concentrating on the benefit of the project that we know, if it’s successful, it’s going to be very beneficial, and if it’s unsuccessful, it could be detrimental for generations.”

“Will the project even come unless we present the right scenario?” House Majority Leader Chuck Kopp, R-Anchorage, asked Nick Fulford, GaffneyCline senior director and global head of gas and LNG.

“You mentioned the buyers want 20–30 years of stability … our fiscal framework might be a little bit out of alignment, if I’m hearing you correctly,” Kopp said.

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“If those things are all true, our needs, our situation, us being out of alignment, we’re going to have to look at possibly a reality that this line doesn’t even get [built],” the representative added.

Federal permits completed

The project completed 20 federal permits and environmental reviews last week, according to the Permitting Council, clearing what the governor called “the last major regulatory hurdle.”

“Alaska LNG received the major federal permits needed to proceed in 2020,” Fitzpatrick said. “Some of these permits have a five-year renewal cycle, which was completed last week and all of Alaska LNG’s major permits are current and in effect. Glenfarne has an ongoing process to maintain permits and authorizations for Alaska LNG.”

With the permits cleared, the pipeline inches toward a final investment decision (FID). Natural Gas Intelligence, a natural gas news provider, described an FID as “the last step of determining whether to move forward with the sanctioning and construction of an infrastructure project.”

A source familiar with the pipeline developments previously told Alaska’s News Source to expect an FID early next year.

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“Alaska LNG will strengthen our economy, create long-term jobs, and provide reliable energy to Alaskans and our global partners for generations to come,” Dunleavy said.

“I am thrilled to see the Alaska LNG project finish federal permitting actions ahead of schedule,” said Permitting Council Executive Director Emily Domenech in the press release.

“This combined effort reflects our commitment to the State of Alaska and to achieving President Trump’s energy dominance agenda.”

Domenech visited the state alongside the congressional Natural Resources Committee in August, when Dunleavy signed a deal with the Trump administration aimed at bringing more resource development investment will come to Alaska.

LNG, however, was not heavily discussed at the meeting.

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Governor Mike Dunleavy (right) shows a signed memorandum of understanding promising “improve(d) coordination and transparency in permitting major infrastructure projects across the state,” his office said.(Rachel McPherron)

“Completing federal permitting for Alaska LNG ahead of schedule shows how the Trump administration is restoring America’s Energy Dominance by cutting unnecessary delays and unleashing our abundant resources,” Interior Secretary Doug Burgum said in the release. “This project strengthens U.S. energy security, creates jobs for Alaskans, and reinforces our commitment to a permitting system that works at the speed of American innovation.”

National momentum

The federal push comes as as GaffneyCline’s presentation said both LNG supply and demand are expected to boom globally. Liquefaction, or the process of turning gas into liquid, is expected to increase by 42% by 2030, reaching about 594 million tons per year.

This summer, Dunleavy vetoed several bills and cut more than $100 million from the state budget, largely due to reduced state revenues from oil price declines.

“The oil situation has deteriorated,” Dunleavy said in a video statement before his budget was revealed. “The price of oil has gone down; therefore, our revenue is going down.

“Basically, we don’t have enough money to pay for all of our obligations. So, as a result of that, you’re going to see some reductions in this year’s budget.”

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The pipeline project has support from both the state and federal levels. President Donald Trump has pledged to ensure an LNG project gets built “to provide affordable energy to Alaska and allies all over the world.”

On Jan. 20, Trump signed the “Unleashing Alaska’s Extraordinary Resource Potential” executive order, which the administration says prioritizes “the development of Alaska’s liquefied natural gas (LNG) potential, including the sale and transportation of Alaskan LNG to other regions of the United States and allied nations within the Pacific region.”

Despite the optimistic timeline, Alaska has seen multiple LNG pipeline proposals fail over the past two decades due to financing challenges, regulatory delays and market conditions.

Environmental groups and some Alaska Native groups have also raised concerns about the pipeline’s potential impact on wildlife and traditional lands.

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