西藏山南地区错那洞穹窿岩石地球化学异常特征

doi:10.11720/wtyht.2020.1001

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Abstract

The Cuonadong Dome is located in the eastern part of the Tethyan Himalaya, within which a Be-W-Sn deposit, accompanied by a variety of rare elements, has been found. On the basis of field investigation and whole-rock geochemical characteristics, the authors discuss the elemental enrichment rules of Au, Ag, Cu, Pb, Zn, W, Sn, Li, Be, As, Sb and U in the dome, by means of geochemical clustering analysis, factor analysis and other methods, combined with the structural characteristics of the dome. Analytical results show that the dome system itself provides sufficient material sources for the enrichment of Sn, As, Be, Li, Pb and W. The dome controls the enrichment of various elements differently. The core mainly controls W, Sn ,Be and Pb. The slip system mainly controls W, Sn and Be. The capping layer mainly controls Pb, Cu, Zn, Ag and Pb elements, and the dome presents the distribution rule of high temperature (W-Sn-Se) -medium temperature (Cu-Pb-Zn) -medium low temperature (Sb-Ag) from the inner part outwards on the whole. The W-Sn-Be elements are highly enriched and large in scale, and are found to be related to pale granite and pegmatite, skarn marble as well as failure of the decollement tectonic-shear caprock.

Key words： rock geochemistry Cuonadong Dome element enrichment hydrothermal mineralization Tibet

Received: 28 December 2018 Published: 03 March 2020

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Corresponding Authors: Guang-Ming LI E-mail: 13982257109@163.com

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	Jian-Cuo Luo-Sang
	Cheng-Shi QING
	Guang-Ming LI
	Lin-Kui ZHANG
	Sui-Liang DONG
	Jian-Gang FU
	Hua-Wen CAO
	Wen-Xing FAN

Cite this article:

Jian-Cuo Luo-Sang,Cheng-Shi QING,Guang-Ming LI, et al. Geochemical anomaly characteristics of Cuonadong Dome,southern Tibet[J]. Geophysical and Geochemical Exploration, 2020, 44(1): 13-24.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2020.1001 OR https://www.wutanyuhuatan.com/EN/Y2020/V44/I1/13

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Sketch geological map of the Lhasa terrane(a) and regional geological map of Himalayan orogenic belt(b)^[20]

Geological map of the Cuonadong dome and comprehensive profile position

The measured geological profile A-A' of Cuonadong dome
1—Quaternary alluvial diluvial;2—thin siltstone intercalates fine sandstone; 3—andalusite-slate intercalated with carbonaceous slate;4—fine sandy slate argillaceous slate;5—cordierite phyllite; 6—garnet cordierite schist;7—silty slate intercalated with garnet mica schist;8—staurolite garnet mica schist intercalated with fine sandy slate;9—staurolite garnet dicmica schist;10—mica quartz schist;11—kyanite schist;12—bands of marble intercalate skarn;13—augen granitic gneiss;14—garnet muscovite directional granite;15—allochroite dimicaceous granite;16—banded granite;17—tourmalinite dimicaceous granite;18—dimicaceous granite;19—beryl pegmatite vein;20—pegmatite vein;21—fault fracture zone;22—upper detachment fault;23—underneath detachment fault

The measured geological profile B-B' of Cuonadong dome
1—garnet dicmica granite; 2—garnet muscovite granite; 3—augen granitic gneiss; 4—tourmaline, garnet muscovite granite; 5—kyanite,garnet mica schist; 6—garnet mica schist; 7—marble; 8—contains tourmaline, staurolite, garnet, mica schist; 9—skarn; 10—foliated marble; 11—metamorphic quartz fine sandstone; 12—grenatite,garnet two mica schists; 13—metamorphic fine sandstone; 14—crushed zone; 15—pegmatite vein; 16—upper detachment fault;17—underneath detachment fault

The measured geological profile information of Cuonadong dome

The background value and abnormal lower limit of the content of surrounding rock elements in the Cuonadong dome

Element enrichment coefficient in rock profile samples of Cuonadong dome

Abnormal grading of element contents in the rock profile samples of Cuonadong dome

variation curves of elements contrast in the rock profile samples of Cuonadong dome

Element correlation coefficient of rock profile sample in chutna cave dome

The R-type clustering pedigree of rock profile sample elements in the cunadong dome

Accumulation of variance of element factor analysis of rock profile samples in Cunadong dome

Element factor analysis of rock profile sample rotation component matrixin of Cuonadong dome

Metamorphic quartz sandstone intercalated in a phyllite

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