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	Diagenesis and very low grade metamorphism in a 7,012 m-deep well Hongcan 1, eastern Tibetan plateau
	Wang, Hejing ; Ma, Yongsheng ; Zhou, Jian ; Xu, Tingjing
	2012
关键词	Diagenesis Very-low-grade metamorphism Illite crystallinity Triassic flysch Tibetan plateau SONGPAN-GANZI COMPLEX TECTONIC EVOLUTION CLAY-MINERALS GEOCHRONOLOGICAL CONSTRAINTS CONTINENTAL SUBDUCTION ILLITE CRYSTALLINITY PELITIC SCHISTS CENTRAL CHINA WHITE MICAS TEMPERATURE
DOI	10.1007/s00015-012-0105-5
英文摘要	This study uses clay mineral assemblages, illite "crystallinity'' (IC), chlorite "crystallinity'' (CC), illite polytypes, the b cell-dimension of K-white mica, mineral geothermo-geobarometers and homogenization temperatures of fluid inclusions to investigate the transition from diagenesis to metamorphism in a 7 km thick Triassic flysch sequence in the well Hongcan 1, eastern Tibetan plateau. The 7,012.8 m deep borehole penetrated flysch of Upper to the Middle Triassic age and represents a unique chance to characterize low temperature metamorphic processes in an unusually thick sedimentary sequence developed on thickened continental crust. Mineral assemblage analysis reveals a burial metamorphic pattern with kaolinite and chlorite/smectite mix-layer phases present in the upper 1,500 m, and illite/smectite mixed-layer phases extending to a depth of 3,000 m. The metamorphic index mineral, graphite, was detected in sedimentary rock below 5,000 m using Raman spectroscopy. There exists a good correlation between IC and CC within the prograde burial sequence; with CC anchizonal boundaries of 0.242 and 0.314 degrees 2 theta (upper and lower boundaries, respectively) corresponding to Kubler's IC limits at 0.25 and 0.42 degrees 2 theta. Illite polytypism also shows an increase in the 2M(1) polytype with increasing depth, with ca. 60 % 2M(1) abundance compared to the 1M type at the surface, to 100 % 2M(1) at the bottom of the borehole. Fluid inclusion analysis show HHC-rich bearing fluids correspond to the diagenetic zone, CH4-rich bearing fluids appear at transitional zone from diagenetic to low anchizone and H2O-rich bearing fluids mark the high anchizone to epizone. Based on chlorite chemical geothermometer, calcite-dolomite geothermo-barometers as well as homogenization temperature of fluid inclusions, a paleotemperature range of 118-348 degrees C is estimated for the well with a pressure facies of low to intermediate type.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000312268800008&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Geosciences, Multidisciplinary; Paleontology; SCI(E); 2; ARTICLE; 2; 249-261; 105
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/155700]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Wang, Hejing,Ma, Yongsheng,Zhou, Jian,et al. Diagenesis and very low grade metamorphism in a 7,012 m-deep well Hongcan 1, eastern Tibetan plateau[J],2012.
APA	Wang, Hejing,Ma, Yongsheng,Zhou, Jian,&Xu, Tingjing.(2012).Diagenesis and very low grade metamorphism in a 7,012 m-deep well Hongcan 1, eastern Tibetan plateau..
MLA	Wang, Hejing,et al."Diagenesis and very low grade metamorphism in a 7,012 m-deep well Hongcan 1, eastern Tibetan plateau".(2012).

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