Magma source and tectonic setting of the porphyritic alkaline basalts in the Silurian Taohekou Formation, North Daba Mountain Constraints from the geochemical features of pyroxene phenocrysts and whole rocks.

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	Magma source and tectonic setting of the porphyritic alkaline basalts in the Silurian Taohekou Formation, North Daba Mountain Constraints from the geochemical features of pyroxene phenocrysts and whole rocks.
	Xiang, ZJ (Xiang ZhongJin); Yan, QR (Yan QuanRen); Yan, Z (Yan Zhen); Wang, ZQ (Wang ZongQi); Wang, T (Wang Tao); Zhang, YL (Zhang YingLi); Qin, XF (Qin XiaoFeng)
刊名	ACTA PETROLOGICA SINICA
	2010
卷号	26 期号:4 页码:1116-1132
关键词	Clinopyroxene phenocryst Porphyritic alkaline basalts Silurian Taohekou Formation North Dabs Mountain
ISSN号	1000-0569
英文摘要	There are four different types of basalts lithofacies in the Silurian Taohekou Formation, including coarse porphyritic basalts, fine porphyritic basalts, amygdaloidal basalts and pillow basalts. All of them are classified to alkaline basalts, and show similar geochemistry features. The basalts are characterized by lower Si, strong differentiation between LREE and HREE, and higher Ti, LILE (including Th, Rb, Ba) and LREE. The REE distribution patterns and trace elements spider diagram of these basalts are the same as the ocean island basalt (OIB). Almost all of the phenocrysts are sahlite or diopside, and their REE and trace elements distribution patterns display good conformity to the basalts'. This implicates that all the basalts are cognate, may be derived from a same primary magma. The depth of host magma chamber which calculated from equilibrium temperatures and pressures between clinopyroxene and melt isn't shallower than 67.65km, which indicates that primary magma originated at mantle. During the upward transporting, magma stagnated and then crystallized at three depth intervals, 39.93 similar to 67.65km, 14.52 similar to 20.46km and 4.62 similar to 9.24km. Coarse porphyritic basalts are rich in phlogopite, which supports that magma source underwent metasomatism by incompatible element-rich melts at mantle. The geochemical feature of clinopyroxene and whole rocks, combining with the volcanic-sedimentary succession suggest that the alkaline basalts in the Silurian Taohekou Formation produced within oceanic plate.
学科主题	火成岩岩石学
WOS关键词	TRACE-ELEMENT ; CLINOPYROXENE COMPOSITION ; PETROGENESIS ; LAVAS ; MELT ; METASOMATISM ; AMPHIBOLES ; ABUNDANCES ; PROVINCE ; ISOTOPE
WOS研究方向	Geology
语种	中文
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000277950600009
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39200]
专题	中国地质调查局
作者单位	Chinese Acad Geol Sci, Inst Mineral Resources, Beijing 100037, Peoples R China
推荐引用方式 GB/T 7714	Xiang, ZJ ,Yan, QR ,Yan, Z ,et al. Magma source and tectonic setting of the porphyritic alkaline basalts in the Silurian Taohekou Formation, North Daba Mountain Constraints from the geochemical features of pyroxene phenocrysts and whole rocks.[J]. ACTA PETROLOGICA SINICA,2010,26(4):1116-1132.
APA	Xiang, ZJ .,Yan, QR .,Yan, Z .,Wang, ZQ .,Wang, T .,...&Qin, XF .(2010).Magma source and tectonic setting of the porphyritic alkaline basalts in the Silurian Taohekou Formation, North Daba Mountain Constraints from the geochemical features of pyroxene phenocrysts and whole rocks..ACTA PETROLOGICA SINICA,26(4),1116-1132.
MLA	Xiang, ZJ ,et al."Magma source and tectonic setting of the porphyritic alkaline basalts in the Silurian Taohekou Formation, North Daba Mountain Constraints from the geochemical features of pyroxene phenocrysts and whole rocks.".ACTA PETROLOGICA SINICA 26.4(2010):1116-1132.