Zircon U-Pb geochronology and geochemistry of the intrusions associated with the Jiawula Ag-Pb-Zn deposit in the Great Xing'an Range, NE China and their implications for mineralization

Niu, Si-Da, Li, Sheng-Rong, Huizenga, Jan Marten, Santosh, M., Zhang, De-Hui, Zeng, Yong-Jie, Li, Zeng-Da, and Zhao, Wen-Bin (2017) Zircon U-Pb geochronology and geochemistry of the intrusions associated with the Jiawula Ag-Pb-Zn deposit in the Great Xing'an Range, NE China and their implications for mineralization. Ore Geology Reviews, 86. pp. 35-54.

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Abstract

Located in the eastern section of the Central Asian Orogenic Belt, the Jiawula Ag-Pb-Zn deposit is classified as a volcanic to subvolcanic related vein-type ore deposit. New U-Pb zircon geochronology, whole-rock geochemistry, mineral chemistry, and Sr-Nd isotope data are presented for the intrusions in the Jiawula deposit in order to evaluate the timing, petrogenetic type of the granitoid rocks, origin and evolution of magmatism, geodynamics, and to establish its relationship with lead-zinc mineralization. Zircon SHRIMP U-Pb analyses yield weighted mean ages of 150.1 +/- 1.8 Ma for quartz porphyry, 148.8 +/- 2.2 Ma for syenite porphyry, and 145.3 +/- 1.9 Ma for monzonite porphyry, indicating a Late Jurassic (Yanshanian) magmatic event. An earlier magmatic event (Indosinian) occurred during the Late Permian to Early Triassic from ca. 254 Ma to ca. 247 Ma and is represented by granodiorite (254 +/- 2 Ma), dacite porphyry (252.9 +/- 4.8 Ma), and diorite porphyry (278 +/- 4.1 Ma). Both the Indosinian and Yanshanian igneous rocks are classified as I-type granitoids. The late Jurassic intrusions are highly fractionated and characterized by negative anomalies of Eu, Sr, P, and Ti. The hypabyssal intrusions have initial Sr-87/Sr-86 values between 0.70458 and 0.70522, and epsilon(Nd)(t) values of -3.4 to -0.2, indicating relatively older crust in Jiawula among more juvenile crust in this area. Magma generation in Jiawula is linked to juvenile lower crustal and slightly enriched mantle sources. The 250 Ma magmatic episode in Jiawula might be related to the subduction of the Mongol-Okhotsk oceanic plate towards the south beneath the Erguna massif. The similar to 150 Ma magmatic event occurred after the closure of the Mongol-Okhotsk Ocean followed by the change in subduction direction of the Paleo-Pacific plate. Varying temperature, stronger fractionation and higher oxygen fugacity related to the magmatic-hydrothermal transition caused Pb-Zn mineralization.

Item ID: 50597
Item Type: Article (Research - C1)
ISSN: 1872-7360
Keywords: SHRIMP U-Pb dating, geochemistry, Sr-Nd isotopes, Jiawula deposit, Great Xing'an Range, Pb-Zn mineralization
Funders: National Key Research and Development Program of China (NKRDP), China Geological Survey (CGS), Ministry of Land and Resources of China (MLRC), Ministry of Education of China (MEC), Fundamental Research Funds for the Central Universities (FRFCU), China Scholarship Council (CSC)
Projects and Grants: NKRDP 2016YFC0600106, CGS 12120114051101, MLRC 201411024-4, MEC 20130022110003, FRFCU 35732015067
Date Deposited: 20 Sep 2017 10:19
FoR Codes: 04 EARTH SCIENCES > 0402 Geochemistry > 040201 Exploration Geochemistry @ 50%
04 EARTH SCIENCES > 0402 Geochemistry > 040203 Isotope Geochemistry @ 50%
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840105 Precious (Noble) Metal Ore Exploration @ 50%
84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840108 Zinc Ore Exploration @ 50%
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