Geochemistry of the Lower Carboniferous mudrocks in the Dulate arc, northeastern Junggar, China: Implications for paleoweathering, provenance and tectonic setting

doi:10.2343/geochemj.2.0515

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 兰州油气中心

	Geochemistry of the Lower Carboniferous mudrocks in the Dulate arc, northeastern Junggar, China: Implications for paleoweathering, provenance and tectonic setting
	Tao, Huifei 1; Qiu, Zhen 2; Ji, Hongjie 1,3; Qiu, Junli 1
刊名	GEOCHEMICAL JOURNAL
	2018
卷号	52 期号:4 页码:299-316
关键词	major and trace elements Lower Carboniferous Mudrock tectonic setting Junggar
ISSN号	0016-7002
DOI	10.2343/geochemj.2.0515
英文摘要	In this study, a combined methods of geochemistry, petrology and mineralogy are used to analyze the Lower Carboniferous clastic rocks from the northeastern Junggar, China, and then the weathering intensity, recycling, provenance and tectonic setting are discussed. The chemical index of alteration (CIA) values and the A-CN-K diagram show that the detritus of the mudrocks experienced a weak to moderate weathering intensity. The low Th/U and Zr/Sc ratios show that the mudrocks experienced a minimal recycling process. The low compositional and textural maturities of the interlayer sandstone reflect a proximal provenance. The low contents of Cr and Ni of the samples exclude the southern adjacent Armantai ophiolites as the potential provenance. Therefore, the nearby northern Dulate arc was the likely source area for the mudrocks. The XRD analysis reveals that the mudrocks contain abundant of quartz, plagioclase (albite) and clay minerals, and some calcite and apatite. The samples have high contents of P2O5, meanwhile, show statistically significant positive correlation between P2O5 and CaO, Y, Sr, and light rare earth elements, also indicating abundant phosphates minerals (e.g., apatite) in the mudrocks. The discriminate plots of the geochemistry (major, trace and rare earth elements) suggest that the source rock compositions are mainly felsic rocks and mixed with a few basic rocks. The tectonic discrimination diagrams of major and trace elements indicate that the mudrocks were originated from oceanic island arcs, which formed in an extensional tectonic environment. Combined with previous studies, the geochemistry data imply there are two evolution stages occurred in the northern Junggar area during the early late Paleozoic time. The northern Junggar was amalgamated to the southern margin of the Chinese Altai before Devonian, and then experienced extensional movements during the early Devonian to early Carboniferous periods. The Dulate arc and arc-related basins in this area were formed during this extensional course.
资助项目	National Natural Science Fund[41502110] ; Youth Innovation Promotion Association CAS[2016068] ; Key Laboratory Project of Gansu Province[1309RTSA041]
WOS关键词	RARE-EARTH-ELEMENTS ; PENNSYLVANIAN-PERMIAN AGE ; UPPER CONTINENTAL-CRUST ; SEDIMENTARY-ROCKS ; EAST JUNGGAR ; CENTRAL-ASIA ; NW CHINA ; ACCRETIONARY OROGENESIS ; SOUTHERN ALTAIDS ; GREENSTONE-BELT
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	GEOCHEMICAL SOC JAPAN
WOS记录号	WOS:000441846300003
资助机构	National Natural Science Fund ; Youth Innovation Promotion Association CAS ; Key Laboratory Project of Gansu Province ; National Natural Science Fund ; Youth Innovation Promotion Association CAS ; Key Laboratory Project of Gansu Province ; National Natural Science Fund ; Youth Innovation Promotion Association CAS ; Key Laboratory Project of Gansu Province ; National Natural Science Fund ; Youth Innovation Promotion Association CAS ; Key Laboratory Project of Gansu Province
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/88094]
专题	地质与地球物理研究所_兰州油气中心
通讯作者	Tao, Huifei
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Gansu Prov Key Lab Petr Resources Res, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China 2.China PetroChina Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Tao, Huifei,Qiu, Zhen,Ji, Hongjie,et al. Geochemistry of the Lower Carboniferous mudrocks in the Dulate arc, northeastern Junggar, China: Implications for paleoweathering, provenance and tectonic setting[J]. GEOCHEMICAL JOURNAL,2018,52(4):299-316.
APA	Tao, Huifei,Qiu, Zhen,Ji, Hongjie,&Qiu, Junli.(2018).Geochemistry of the Lower Carboniferous mudrocks in the Dulate arc, northeastern Junggar, China: Implications for paleoweathering, provenance and tectonic setting.GEOCHEMICAL JOURNAL,52(4),299-316.
MLA	Tao, Huifei,et al."Geochemistry of the Lower Carboniferous mudrocks in the Dulate arc, northeastern Junggar, China: Implications for paleoweathering, provenance and tectonic setting".GEOCHEMICAL JOURNAL 52.4(2018):299-316.