Hydrothermal alteration of dolostones in the Lower Ordovician, Tarim Basin, NW China: Multiple constraints from petrology, isotope geochemistry and fluid inclusion microthermometry

doi:10.1016/j.marpetgeo.2013.06.013

	Hydrothermal alteration of dolostones in the Lower Ordovician, Tarim Basin, NW China: Multiple constraints from petrology, isotope geochemistry and fluid inclusion microthermometry
	Dong, Shaofeng 1,2; Chen, Daizhao 1; Ling, Hairuo 3; Zhou, Xiqiang 1,2; Wang, Dan 4; Guo, Zenghui 1,2; Jiang, Maosheng 1; Qian, Yixiong 5
刊名	MARINE AND PETROLEUM GEOLOGY
	2013-09-01
卷号	46 页码:270-286
关键词	Tarim Basin Lower Ordovician Tectono-magmatism Isotope Geochemistry U-pb Isotope Dating Hydrothermally-altered Dolostone
ISSN号	0264-8172
DOI	10.1016/j.marpetgeo.2013.06.013
文献子类	Article
英文摘要	Massive dolostones pervasively occur in the Lower Paleozoic strata in Tarim Basin, NW China. This study focuses on the hydrothermally-altered dolostones in the Lower Ordovician at Sancha, Bachu County where the hydrothermally-altered dolostones, marbles and diabase intrusions co-occur within a large-scale, NW trending strike-slip fault zone. Within this zone, the intrusive diabases mostly occur along the master border faults to the east and west, respectively. The limestones that got in contact with the intrusions commonly were marbleized and the antecedent dolostones were subject to intense hydrothermal alteration, particularly along fractured portions. Based on field investigations and petrographic examinations on the hydrothermally-altered dolostones, five distinctive fabrics of matrix and cement dolomites are distinguished. Two episodes of vein-filling calcites postdate the hydrothermally-precipitated saddle dolomites. Integrated isotopic geochemistry (C, O and Sr) and fluid inclusion microthermometry suggest that dolomite recrystallization and precipitation were associated with the hydrothermal activity induced by fracturing/faulting and intrusive magmatism. CAMECA SIMS U-Pb isotopic dating of zircon grains from the diabases yields an age of 290.5 +/- 2.9 Ma in the Early Permian, which reconciles the relative timing revealed by the paragenetic history. The magmatic emplacement was thus linked to the large igneous province (LIP) of Early Permian in Tarim Basin. In this case, the widespread magmatic activities could have caused the thermal anomaly and fracturing in the strata that were penetrated by the intrusions, enhancing the thermal diffusion and hydrothermal fluid migration (although minor volumes of thermal fluids from the basic magmas) through the fracture/fault systems, thereby resulting in contact metamorphism (or marbleization), recrystallization of matrix dolomites and dolomite precipitation commonly in primary dolostone successions. This study provides a useful analogue to understand the dolomitization and relevant issues for the deeply-buried dolostones associated with tectono-magmatism within the Tarim Basin and elsewhere. (C) 2013 Elsevier Ltd. All rights reserved.
WOS关键词	COEVAL SEAWATER ; SILURIAN BRACHIOPODS ; DOLOMITE NEOMORPHISM ; EASTERN PONTIDES ; MASSIVE DOLOMITE ; IGNEOUS ROCKS ; MANTLE PLUME ; DOLOMITIZATION ; CARBONATES ; RECRYSTALLIZATION
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000324223400017
资助机构	SINOPEC ; SINOPEC ; National Key Scientific Special Project(2008ZX05008-003-002 ; National Key Scientific Special Project(2008ZX05008-003-002 ; National Key Basic Research Project(2012CB214802) ; National Key Basic Research Project(2012CB214802) ; State Key Lab of Oil/Gas Reservoir Geology and Exploitation at CDUT(PLC200801) ; State Key Lab of Oil/Gas Reservoir Geology and Exploitation at CDUT(PLC200801) ; 2011ZX05008-003-10) ; 2011ZX05008-003-10) ; SINOPEC ; SINOPEC ; National Key Scientific Special Project(2008ZX05008-003-002 ; National Key Scientific Special Project(2008ZX05008-003-002 ; National Key Basic Research Project(2012CB214802) ; National Key Basic Research Project(2012CB214802) ; State Key Lab of Oil/Gas Reservoir Geology and Exploitation at CDUT(PLC200801) ; State Key Lab of Oil/Gas Reservoir Geology and Exploitation at CDUT(PLC200801) ; 2011ZX05008-003-10) ; 2011ZX05008-003-10) ; SINOPEC ; SINOPEC ; National Key Scientific Special Project(2008ZX05008-003-002 ; National Key Scientific Special Project(2008ZX05008-003-002 ; National Key Basic Research Project(2012CB214802) ; National Key Basic Research Project(2012CB214802) ; State Key Lab of Oil/Gas Reservoir Geology and Exploitation at CDUT(PLC200801) ; State Key Lab of Oil/Gas Reservoir Geology and Exploitation at CDUT(PLC200801) ; 2011ZX05008-003-10) ; 2011ZX05008-003-10) ; SINOPEC ; SINOPEC ; National Key Scientific Special Project(2008ZX05008-003-002 ; National Key Scientific Special Project(2008ZX05008-003-002 ; National Key Basic Research Project(2012CB214802) ; National Key Basic Research Project(2012CB214802) ; State Key Lab of Oil/Gas Reservoir Geology and Exploitation at CDUT(PLC200801) ; State Key Lab of Oil/Gas Reservoir Geology and Exploitation at CDUT(PLC200801) ; 2011ZX05008-003-10) ; 2011ZX05008-003-10)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/86478]
专题	中国科学院地质与地球物理研究所
通讯作者	Chen, Daizhao
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China 3.Univ Regina, Dept Geol, Regina, SK S4S 0A2, Canada 4.China Natl Offshore Oil Corp, Res Inst, Beijing, Peoples R China 5.Northwest Explorat & Prod Co, SINOPEC, Urumqi 830011, Peoples R China
推荐引用方式 GB/T 7714	Dong, Shaofeng,Chen, Daizhao,Ling, Hairuo,et al. Hydrothermal alteration of dolostones in the Lower Ordovician, Tarim Basin, NW China: Multiple constraints from petrology, isotope geochemistry and fluid inclusion microthermometry[J]. MARINE AND PETROLEUM GEOLOGY,2013,46:270-286.
APA	Dong, Shaofeng.,Chen, Daizhao.,Ling, Hairuo.,Zhou, Xiqiang.,Wang, Dan.,...&Qian, Yixiong.(2013).Hydrothermal alteration of dolostones in the Lower Ordovician, Tarim Basin, NW China: Multiple constraints from petrology, isotope geochemistry and fluid inclusion microthermometry.MARINE AND PETROLEUM GEOLOGY,46,270-286.
MLA	Dong, Shaofeng,et al."Hydrothermal alteration of dolostones in the Lower Ordovician, Tarim Basin, NW China: Multiple constraints from petrology, isotope geochemistry and fluid inclusion microthermometry".MARINE AND PETROLEUM GEOLOGY 46(2013):270-286.