In situ geochemistry of Lower Paleozoic dolomites in the northwestern   Tarim basin: Implications for the nature, origin, and evolution of   diagenetic fluids

doi:10.1002/2013GC005194

CORC > 北京大学 > 地球与空间科学学院

	In situ geochemistry of Lower Paleozoic dolomites in the northwestern Tarim basin: Implications for the nature, origin, and evolution of diagenetic fluids
	Zhang, Wei ; Guan, Ping ; Jian, Xing ; Feng, Fan ; Zou, Caineng
刊名	geochemistry geophysics geosystems
	2014
关键词	RARE-EARTH-ELEMENT LA-ICP-MS DEVONIAN PRESQUILE BARRIER LOWER ORDOVICIAN DOLOMITES CANADA SEDIMENTARY BASIN BANDED IRON FORMATIONS NORTHERN QAIDAM BASIN NW CHINA TRACE-ELEMENTS EPIGENETIC DOLOMITIZATION
DOI	10.1002/2013GC005194
英文摘要	Lower Paleozoic sedimentary rocks in the northwestern Tarim basin were strongly altered by complicated geofluids, which resulted in the occurrence of various diagenetic minerals (e. g., dolomite). Here, in situ major, trace, and rare earth element geochemistry of Lower Ordovician diagenetic dolomite grains as well as petrography were performed to unravel the geochemical features, the nature, and origin of the diagenetic fluids. The results indicate that different geochemical information can be detected within a single sample, even within a single dolomite grain. Five generations of diagenetic dolomite have been identified based on geochemical signatures, resulting from four distinct types of diagenetic fluids: (1) HREE enrichment (PAAS-normalized), low Sigma REE, no Eu anomaly, low Mn, Ba, moderate Fe, and high Sr contents are probably due to early burial dolomitizing fluids; (2) MREE enrichment, high Sigma REE, high Mn, Fe, and low Sr content are likely to be associated with Devonian deep-circulating crustal hydrothermal fluids; (3) flat or LREE enrichment pattern with obviously positive Eu anomaly is inferred to be linked to Permian magmatic hydrothermal fluids; and (4) flat REE pattern, moderate Sigma REE, no Eu anomaly, low Mn, Ba, moderate Fe, and high Sr contents are probably due to late burial dolomitizing fluids. The significances of in situ method demonstrated in this study, compared with the whole rock analysis, include not only contamination-free analysis but also unraveling the internal geochemical variation within a single sample or a mineral grain. Thus, for the geochemical study of complicated diagenetic process, in situ method should be preferentially considered.; Geochemistry & Geophysics; SCI(E); EI; 0; ARTICLE; pguanl@pku.edu.cn; 7; 2744-2764; 15
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/155946]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Zhang, Wei,Guan, Ping,Jian, Xing,et al. In situ geochemistry of Lower Paleozoic dolomites in the northwestern Tarim basin: Implications for the nature, origin, and evolution of diagenetic fluids[J]. geochemistry geophysics geosystems,2014.
APA	Zhang, Wei,Guan, Ping,Jian, Xing,Feng, Fan,&Zou, Caineng.(2014).In situ geochemistry of Lower Paleozoic dolomites in the northwestern Tarim basin: Implications for the nature, origin, and evolution of diagenetic fluids.geochemistry geophysics geosystems.
MLA	Zhang, Wei,et al."In situ geochemistry of Lower Paleozoic dolomites in the northwestern Tarim basin: Implications for the nature, origin, and evolution of diagenetic fluids".geochemistry geophysics geosystems (2014).