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Thermochronological evolution of retrogressed Caledonian eclogites, Lofoten Islands, Norway.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Thermochronological evolution of retrogressed Caledonian eclogites, Lofoten Islands, Norway./
作者:	Bethke, Herbert Fournier Wilhelm.
面頁冊數:	1 online resource (564 pages)
附註:	Source: Dissertation Abstracts International, Volume: 75-01C.
Contained By:	Dissertation Abstracts International75-01C.
標題:	Geology. -
電子資源:	click for full text (PQDT)

Thermochronological evolution of retrogressed Caledonian eclogites, Lofoten Islands, Norway.
Bethke, Herbert Fournier Wilhelm.

Thermochronological evolution of retrogressed Caledonian eclogites, Lofoten Islands, Norway. - 1 online resource (564 pages)

Source: Dissertation Abstracts International, Volume: 75-01C.

Thesis (Ph.D.)

Includes bibliographical references

The major challenge in understanding the history in high-pressure continental terranes is dating the timing and duration of fluid infiltration and circulation events related to eclogitization and exhumation. Through a combination of high-resolution 40Ar/39Ar and Rb/Sr dating, coupled with detailed petrological and geochemical studies and numerical Ar-diffusion modelling, the thermal history of the Lofoten Islands -- a continental terrane in northern Norway transected by Caledonian (c. 480 Ma) eclogite-facies shear zones formed at P ≈ 15 kbar and T ≈ 680°C -- was studied to elucidate its associated fluid infiltration and melt injection histories.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

Subjects--Topical Terms:

670379
Geology.
Index Terms--Genre/Form:

554714
Electronic books.

Thermochronological evolution of retrogressed Caledonian eclogites, Lofoten Islands, Norway.
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245 1 0 $a Thermochronological evolution of retrogressed Caledonian eclogites, Lofoten Islands, Norway.
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500 $a Source: Dissertation Abstracts International, Volume: 75-01C.
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504 $a Includes bibliographical references
520 $a The major challenge in understanding the history in high-pressure continental terranes is dating the timing and duration of fluid infiltration and circulation events related to eclogitization and exhumation. Through a combination of high-resolution 40Ar/39Ar and Rb/Sr dating, coupled with detailed petrological and geochemical studies and numerical Ar-diffusion modelling, the thermal history of the Lofoten Islands -- a continental terrane in northern Norway transected by Caledonian (c. 480 Ma) eclogite-facies shear zones formed at P ≈ 15 kbar and T ≈ 680°C -- was studied to elucidate its associated fluid infiltration and melt injection histories.
520 $a Six shear zones were studied from two islands -- Vestvagoy and Flakstadoy. 40Ar/39Ar results in eclogitic garnet indicate that the fluids involved in the eclogitization at T ≈ 650--600°C (newly estimated temperatures) were 40Ar-rich. 40Ar/39Ar results and numerical models reveal that isothermal retrogression to amphibolite facies occurred at 425 Ma, lasting an integrated time of ≈ 1 Ma, during which the zones served as pathways for 40Ar-rich hot fluids that migrated through conduits reaching the overlying allochthon of Vestvagoy. The models indicate that the retrogressed eclogites and allochthon were exhumed soon after the eclogitization to shallower crustal levels (depth ≈ 8 km) where the ambient T did not exceed 300°C. These rock units remained at these levels for 90 Ma and 60 Ma, respectively, and experienced episodic injection of hot fluids associated with extensional events and local melt intrusions. 40Ar-poor fluids at 415 Ma infiltrated the zones at T ≈ 500°C for c. 100 ka in the Flakstadoy basement and at T ≈ 650°C for c. 400 ka in the allochthon of Vestvagoy. 40Ar-rich fluids at c. 365 Ma infiltrated the zones in Vestvagoy reaching the allochthonous at T ≈ 600°C for c. 150 ka. In a zone of Flakstadoy, a melt intrusion at 335 Ma reheated the rocks at T ≈ 500°C for c. 25 ka. Short-lived thermal events such as melt intrusions (390 Ma and 320 Ma) and fluid infiltration (280 Ma, 200 Ma, 180 Ma and 55 Ma), continued in different shear zones of Flakstadoy associated with Pangaea breakup and seafloor spreading.
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538 $a Mode of access: World Wide Web
650 4 $a Geology. $3 670379
650 4 $a Petrology. $3 783490
650 4 $a Geochemistry. $3 648291
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