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Petrology and geochemistry of mafic-...

Tsai, Chin-Ho.

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Petrology and geochemistry of mafic-ultramafic rocks in the North Dabie Complex, central-eastern China.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Petrology and geochemistry of mafic-ultramafic rocks in the North Dabie Complex, central-eastern China./
作者:	Tsai, Chin-Ho.
面頁冊數:	171 p.
附註:	Source: Dissertation Abstracts International, Volume: 59-08, Section: B, page: 3972.
Contained By:	Dissertation Abstracts International59-08B.
標題:	Geology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9901624
ISBN:	9780591986938

Petrology and geochemistry of mafic-ultramafic rocks in the North Dabie Complex, central-eastern China.
Tsai, Chin-Ho.

Petrology and geochemistry of mafic-ultramafic rocks in the North Dabie Complex, central-eastern China. - 171 p.

Source: Dissertation Abstracts International, Volume: 59-08, Section: B, page: 3972.

Thesis (Ph.D.)--Stanford University, 1998.

Mineral compositions and microstructures of a newly identified eclogite in the North Dabie Complex (NDC), record early very high pressure metamorphism in a dominant amphibolite-facies host, where no eclogite has been positively identified before. The eclogite-facies relics were strongly overprinted by granulite-to-amphibolite-facies assemblages. A spectacular microstructure of oriented quartz needles (${\sim}2{-}20\ \mu$m thick, ${\sim}5{-}200\ \mu$m long) in matrix clinopyroxene implies the prior existence of a supersilicic clinopyroxene stabilized at ultrahigh-pressure (UHP $>$ 25 kbar) conditions. It is suggested that part of the NDC was subjected to UHP metamorphism.

ISBN: 9780591986938Subjects--Topical Terms:

516570
Geology.

Petrology and geochemistry of mafic-ultramafic rocks in the North Dabie Complex, central-eastern China.
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245 1 0 $a Petrology and geochemistry of mafic-ultramafic rocks in the North Dabie Complex, central-eastern China.
300 $a 171 p.
500 $a Source: Dissertation Abstracts International, Volume: 59-08, Section: B, page: 3972.
500 $a Adviser: Juhn G. Liou.
502 $a Thesis (Ph.D.)--Stanford University, 1998.
520 $a Mineral compositions and microstructures of a newly identified eclogite in the North Dabie Complex (NDC), record early very high pressure metamorphism in a dominant amphibolite-facies host, where no eclogite has been positively identified before. The eclogite-facies relics were strongly overprinted by granulite-to-amphibolite-facies assemblages. A spectacular microstructure of oriented quartz needles (${\sim}2{-}20\ \mu$m thick, ${\sim}5{-}200\ \mu$m long) in matrix clinopyroxene implies the prior existence of a supersilicic clinopyroxene stabilized at ultrahigh-pressure (UHP $>$ 25 kbar) conditions. It is suggested that part of the NDC was subjected to UHP metamorphism.
520 $a The Raobazhai ultramafic body, consisting of spinel-bearing metaharzburgite, metadunite, and metalherzolite, is a tectonic slice enclosed in granulite-to-amphibolite-facies gneisses. In the metalherzolite, fine-grained intergrowths of spinel, orthopyroxene, and clinopyroxene occur, implying decomposition products from a garnet precursor. The meta-ultramafics consist of forsterite, enstatite, magnesio-hornblende to pargasite, and spinel, with or without clinopyroxene, indicating amphibolite-facies and granulite-facies metamorphism. Geothermometric estimations show that the meta-ultramafics reequilibrated at 700-820$\sp\circ$C (6-12 kbar), although an early, higher pressure stage ($\ge$18-20 kbar) is possible, based on the implied existence of precursor garnet. Petrochemical and geothermobarometric data imply that the ultramafic slice may represent a piece of former mantle wedge, which was tectonically incorporated into a subducted crustal slab and subsequently reequilibrated at granulite-to-amphibolite-facies conditions.
520 $a The Jiaoziyan Gabbro is the largest mafic intrusion in the NDC. $\rm\sp{40}Ar/\sp{39}Ar$ isotopic analyses of biotite separates demonstrate that cooling (${<}300\sp\circ$C) of the intrusion occurred at 124-125 Ma. The Cretaceous age is about 80-100 Ma younger than the timing of Dabie UHP metamorphism; thus the intrusion cannot be attributed to having been triggered by "slab breakoff" during the Triassic collision between the Sino-Korean and Yangtze cratons. The lack of syncollisional magmatism in the NDC indicates that its protoliths could be parts of a subducted slab. The Cretaceous thermal overprint was so strong that the majority of the formerly subducted NDC were reequilibrated or partially melted after early-stage exhumation.
590 $a School code: 0212.
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