Late Palaeozoic-Early Mesozoic tectonic-magmatic evolution and mineralization in the eastern section of the East Kunlun Orogenic Belt

doi:10.13745/j.esf.sf.2020.4.20

Abstract

Abstract:

The East Kunlun Orogenic Belt (EKOB) in the western segment of the Central Orogenic System of China experienced complex and multiple tectono-magmatic events in the past hundreds of millions of years. These tectono-magmatic events from the Late Paleozoic-Early Mesozoic magmatism are most closely related to mineralization. In researching the distribution, evolution and petrogenesis of Late Paleozoic-Early Mesozoic intrusive magmatic rocks as well as geological characteristics of deposits, we investigated the close relationship between tectono-magmatic evolution and mineralization in the eastern part of East Kunlun during this period. Overall, the tectonic evolution of the EKOB can be divided into three stages: the oceanic crust subduction stage (277-240 Ma), syn-collision stage (240-230 Ma) and post-collision stage (230-200 Ma). Crust-mantle magma mixing and mingling occurred during the entire evolutionary process of the Paleo-Tethys Ocean. The mafic plutons are most likely derived from partial co-melting of metasomatic mantle wedge and subduction fluid. Most of the granite magmatites are partial-melting products of the lower crust. The crust-mantle magmatic mixing in the subduction stage of the eastern part of the East Kunlun Orogen brings not only mineralization materials resulting in enrichment of some elements, but also heat source. Physical and chemical deformations of the ore-forming fluid cause mineral precipitation to form a large number of mineral deposits. The main metallogenic combinations are Cu, Mo and Au in small size deposits. In the syn-collision stage, magmatic rock developed rarely due to compressive stress, with ore deposits mainly distributing along the EKOB faults, containing main ore metals Cu, Mo and Au. In the post-collision stage, delamination of lithospheric mantle in an extensional environment provided a channel for mantle materials to participate in mineralization. And the conversion stage from the collision to post-collision stage, specially, is the peak period of Cu, Pb, Zn and Fe metallogenesis from the Late Paleozoic to Early Mesozoic in this area.

Key words: East Kunlun Orogenic Belt, Late Paleozoic to Early Mesozoic, magma evolution, magma mixing and mingling, mineralization

CLC Number:

CHEN Guochao, PEI Xianzhi, LI Ruibao, LI Zuochen, PEI Lei, LIU Chengjun, CHEN Youxin, WANG Meng, GAO Feng, WEI Junqi. Late Palaeozoic-Early Mesozoic tectonic-magmatic evolution and mineralization in the eastern section of the East Kunlun Orogenic Belt[J]. Earth Science Frontiers, 2020, 27(4): 33-48.

Figures/Tables 9

References 156

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对比项		不同形成时段的花岗岩类特征
对比项		277~245 Ma	245~240 Ma	240~230 Ma	230~200 Ma
岩石组合		石英闪长岩和花岗闪长岩	花岗闪长岩和二长花岗岩	花岗闪长岩、白云母/二云母花岗岩和正长花岗岩	花岗闪长岩、二长花岗岩和正长花岗岩
岩石构造组合		准铝质中钾钙碱性I型花岗岩	准铝质中钾钙碱性I型花岗岩	S型花岗岩、I型花岗岩	高钾钙碱性系列岩石,A₂型花岗岩、埃达克质岩浆岩、I型花岗岩
主量元素特征	N₂O/K₂O	1.24	1.19	0.97	1.10
	A/CNK	0.98	0.97	1.03	1.03
	Mg^#	32	42.53	30.22	39.56
稀土和微量元素特征	w(REE)/10^-6	146.00	141.16	141.46	131.96
	LREE/HREE	9.24	10.79	11.63	10.80
	La_N/Yb_N	10.82	13.30	13.05	13.21
	δEu	0.73	0.78	0.61	0.74
	Nb/Ta	12	13.81	11.07	12.63
构造背景		俯冲		同碰撞	后碰撞

对比项		不同形成时段的花岗岩类特征
对比项		277~245 Ma	245~240 Ma	240~230 Ma	230~200 Ma
岩石组合		石英闪长岩和花岗闪长岩	花岗闪长岩和二长花岗岩	花岗闪长岩、白云母/二云母花岗岩和正长花岗岩	花岗闪长岩、二长花岗岩和正长花岗岩
岩石构造组合		准铝质中钾钙碱性I型花岗岩	准铝质中钾钙碱性I型花岗岩	S型花岗岩、I型花岗岩	高钾钙碱性系列岩石,A₂型花岗岩、埃达克质岩浆岩、I型花岗岩
主量元素特征	N₂O/K₂O	1.24	1.19	0.97	1.10
	A/CNK	0.98	0.97	1.03	1.03
	Mg^#	32	42.53	30.22	39.56
稀土和微量元素特征	w(REE)/10^-6	146.00	141.16	141.46	131.96
	LREE/HREE	9.24	10.79	11.63	10.80
	La_N/Yb_N	10.82	13.30	13.05	13.21
	δEu	0.73	0.78	0.61	0.74
	Nb/Ta	12	13.81	11.07	12.63
构造背景		俯冲		同碰撞	后碰撞