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| Keywords | |
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LA － ICP － MS zircon U － Pb dating |
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Lu － Hf isotopes |
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petrogeochemistry |
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Yuejinshan coppergold
deposit |
| Authors | |
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WANG Chong-yi |
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HAO Yu-jie |
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SHANG Qing-qing |
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SHI Yu-fan |
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GAO Yu |
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ＲEN Yun-sheng |
| PubMed | |
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Article by Wang C |
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Article by Hao Y |
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Article by Shang Q |
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Article by Shi Y |
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Article by Gao Y |
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Article by Ｒen Y |
Chronological and geochemical characteristics of granodiorite from Yuejinshan skarn － type copper － gold deposit in Heilongjiang Province
1. College of Earth Sciences，Jilin University，Changchun 130061，China;
2. College of Earth Sciences，Institute of Disaster Prevention，Sanhe 065201，Hebei，China
The LA － ICP － MS zircon U － Pb dating and Lu － Hf isotopic analyses as well as whole-rock geochemistry study were carried on the granodiorite related to skarn mineralization in Yuejinshan copper-gold deposit．The results show that the weighted average age of 206Pb /238U of 26 zircon points in the granodiorite is ( 118. 96 ±0. 77) Ma ( MSWD = 0. 29) ． The εHf
( t) values of zircons in the rock mass are all positive ( + 1. 4 ～ + 3. 2) ，with young Hf two-stage model age ( TDM2 = 1. 09 ～ 0. 98 Ga) ． Geochemically，the granodiorite is rich in Al，K，
Na，and depleted in Ti，P，Ca，indicating calcium alkaline I-type granite． For rare earth elements ( ＲEE) composition，the granodiorite is enriched in light ＲEE and depleted in heavy ＲEE． Combined with the low positive εHf
( t) values，it is indicated that the magma is from a mixing source between crust and mantle． Based on the petrogeochemical mapping and the evolution of the regional tectonic background，both the granodiorite and granite porphyry belong to post-collision volcanic arc granites． The metallogenic diagenesis of the study area is directly related to the lower lithosphere mantle delamination under the tectonic environment of intense subduction of the Paleo － Pacific
Ocean plate．
deposit
in Tianshui area and its geological significance
[J]. , 2021,40(2): 298-306