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New Insights into Accretion and Cooling of Lower Ocean Crust at Ultraslow- and Fast-Spreading Mid-Ocean Ridges.

Record Type:	Electronic resources : Monograph/item
Title/Author:	New Insights into Accretion and Cooling of Lower Ocean Crust at Ultraslow- and Fast-Spreading Mid-Ocean Ridges./
Author:	Doorn, Christopher James.
Description:	1 online resource (609 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 83-12, Section: B.
Contained By:	Dissertations Abstracts International83-12B.
Subject:	Geology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29207356click for full text (PQDT)
ISBN:	9798438768784

New Insights into Accretion and Cooling of Lower Ocean Crust at Ultraslow- and Fast-Spreading Mid-Ocean Ridges.
Doorn, Christopher James.

New Insights into Accretion and Cooling of Lower Ocean Crust at Ultraslow- and Fast-Spreading Mid-Ocean Ridges. - 1 online resource (609 pages)

Source: Dissertations Abstracts International, Volume: 83-12, Section: B.

Thesis (Ph.D.)--University of Wyoming, 2022.

Includes bibliographical references

Mid-ocean ridges are the primary divergent tectonic margins and generate the ocean crust, which covers ~60% of Earth's surface. The gabbroic lower ocean crust hosts lithologic and structural diversity varying with spreading rate and magma supply. This dissertation examines lower crustal accretion at ultraslow- and fast-spreading ridges to better constrain crustal accretion and cooling across spreading rates. Trace element compositions of zircon from Atlantis Bank (Southwest Indian Ridge) characterize the final stages of magmatism and the thermal architecture in the lower crust produced along an ultraslow-spreading ridge. U-Pb zircon dates of evolved gabbroic rocks from the fast-spread lower crust at Pito Deep (East Pacific Rise) reveal significant off-axis magmatism, implying locally robust magmatism and relatively slow cooling of this nascent ocean crust. Textural characteristics of gabbroic rocks from Pito Deep highlight the lateral complexity of the fast-spread lower crust, and record increasing degrees of magmatic strain with depth. Synthesizing textural data, U-Pb geochronology, mineral chemistry, and magnetic data from Pito Deep supports a pulsed gabbro glacier flow process for generating the lower ocean crust at magmatically robust fast-spreading ridges.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798438768784Subjects--Topical Terms:

516570
Geology.
Subjects--Index Terms:

GabbroIndex Terms--Genre/Form:

542853
Electronic books.

New Insights into Accretion and Cooling of Lower Ocean Crust at Ultraslow- and Fast-Spreading Mid-Ocean Ridges.
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502 $a Thesis (Ph.D.)--University of Wyoming, 2022.
504 $a Includes bibliographical references
520 $a Mid-ocean ridges are the primary divergent tectonic margins and generate the ocean crust, which covers ~60% of Earth's surface. The gabbroic lower ocean crust hosts lithologic and structural diversity varying with spreading rate and magma supply. This dissertation examines lower crustal accretion at ultraslow- and fast-spreading ridges to better constrain crustal accretion and cooling across spreading rates. Trace element compositions of zircon from Atlantis Bank (Southwest Indian Ridge) characterize the final stages of magmatism and the thermal architecture in the lower crust produced along an ultraslow-spreading ridge. U-Pb zircon dates of evolved gabbroic rocks from the fast-spread lower crust at Pito Deep (East Pacific Rise) reveal significant off-axis magmatism, implying locally robust magmatism and relatively slow cooling of this nascent ocean crust. Textural characteristics of gabbroic rocks from Pito Deep highlight the lateral complexity of the fast-spread lower crust, and record increasing degrees of magmatic strain with depth. Synthesizing textural data, U-Pb geochronology, mineral chemistry, and magnetic data from Pito Deep supports a pulsed gabbro glacier flow process for generating the lower ocean crust at magmatically robust fast-spreading ridges.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
650 4 $a Geology. $3 516570
650 4 $a Marine geology. $3 3173821
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773 0 $t Dissertations Abstracts International $g 83-12B.
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