Zircon U–Pb geochronology and geochemistry of the Late Jurassic granite porphyries from central-eastern Jilin Province, NE China: Petrogenesis and tectonic implications

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Island Arc Pub Date : 2022-09-13 DOI:10.1111/iar.12464
Xiqing Ye, Zhitao Xu, Mengmeng Li, Liying Sun, Zhongwei Li, Donghan Yan, Jingqiao Feng
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Abstract

The recently discovered Yizuoying Mo deposit is located in central-eastern Jilin Province, NE China. The molybdenum (Mo) mineralization, mainly hosted in granite porphyry, is considered to be granite-related. Zircon U–Pb dating of the granite porphyry yielded concordant ages of 160.81 ± 0.62 Ma, which is consistent with the weighted mean U–Pb age of 160.53 ± 0.65 Ma, indicating that the emplacement of granitic plutons occurred in the Late Jurassic. The granite porphyry samples are peraluminous, high-K calc-alkaline and show an A-type geochemical signature with high Na2O + K2O and Zr + Nb + Ce + Y content, K2O/MgO, Fe2O3T/(Fe2O3T + MgO), REEs (rare earth elements) and 10 000 Ga/Al ratios. Based on the trace element content of zircons, they have high Th, U, Zr, Hf, and Pb abundance and obvious La and Eu anomalies, and their distribution pattern is similar to that of A-type granites. The zircon εHf(t) values range from 4.5 to 10.5 with Neoproterozoic TDM2 ages (536–922 Ma) for Hf isotopes, and they have relatively high values of εNd(t) (3.14 to 3.49; TDM2 = 665–693 Ma) and initial 87Sr/86Sr (0.723260–0.734669). Detailed elemental and isotopic data suggest that the Yizuoying granite porphyry belongs to the A2-subtype and was formed by partial melting of a crustal source with a neoproterozoic overall residence age. Integrating new data on the oxygen fugacity of zircons and published data on the tectonic evolution, we suggest that the granite porphyry and associated Mo mineralization in the Yizuoying deposit formed in an extensional environment at ~160 Ma, related to the subduction of the Paleo-Pacific plate. The evolution of granitic magma in this period contributed to Mo mineralization.

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吉林中东部晚侏罗世花岗斑岩的锆石U-Pb年代学和地球化学:岩石成因及其构造意义
新近发现的一岞营钼矿位于中国吉林省中东部。钼矿化主要赋存于花岗岩斑岩中,与花岗岩有关。花岗岩斑岩的锆石U-Pb年龄为160.81±0.62 Ma,与160.53±0.65 Ma的加权平均U-Pb年龄一致,表明花岗岩岩体的侵位发生在晚侏罗世。花岗岩斑岩样品具有过铝质、高钾钙碱性特征,具有较高的Na2O + K2O和Zr + Nb + Ce + Y含量、K2O/MgO、Fe2O3T/(Fe2O3T + MgO)、稀土元素(REEs)和10000 Ga/Al比值等a型地球化学特征。从锆石微量元素含量来看,其Th、U、Zr、Hf、Pb丰度较高,La、Eu异常明显,分布模式与a型花岗岩相似。锆石εHf(t)值在4.5 ~ 10.5之间,与新元古代TDM2年龄(536 ~ 922 Ma)相符,εNd(t)值较高(3.14 ~ 3.49);TDM2 = 665-693 Ma)和初始87Sr/86Sr(0.723260-0.734669)。详细的元素和同位素资料表明,宜佐营花岗斑岩属于a2亚型,是由新元古代总停留年龄的地壳源部分熔融形成的。综合锆石氧逸度的新资料和已发表的构造演化资料,我们认为依左营矿床的花岗斑岩及其伴生钼矿化形成于~160 Ma的伸展环境,与古太平洋板块的俯冲有关。这一时期花岗质岩浆的演化促进了钼矿化。
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来源期刊
Island Arc
Island Arc 地学-地球科学综合
CiteScore
2.90
自引率
26.70%
发文量
32
审稿时长
>12 weeks
期刊介绍: Island Arc is the official journal of the Geological Society of Japan. This journal focuses on the structure, dynamics and evolution of convergent plate boundaries, including trenches, volcanic arcs, subducting plates, and both accretionary and collisional orogens in modern and ancient settings. The Journal also opens to other key geological processes and features of broad interest such as oceanic basins, mid-ocean ridges, hot spots, continental cratons, and their surfaces and roots. Papers that discuss the interaction between solid earth, atmosphere, and bodies of water are also welcome. Articles of immediate importance to other researchers, either by virtue of their new data, results or ideas are given priority publication. Island Arc publishes peer-reviewed articles and reviews. Original scientific articles, of a maximum length of 15 printed pages, are published promptly with a standard publication time from submission of 3 months. All articles are peer reviewed by at least two research experts in the field of the submitted paper.
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