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Open AccessArticle

Early Jurassic Mafic Intrusions in the Southern Youjiang Basin, SW China: Petrogenesis, Tectonic and Metallogenic Implications

1
College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
2
Institute of Geology of Chinese Academy of Geological Sciences, Beijing 100037, China
3
Department of Student Affairs, Beihang University, Beijing 100191, China
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(12), 771; https://doi.org/10.3390/min9120771
Received: 28 October 2019 / Revised: 7 December 2019 / Accepted: 8 December 2019 / Published: 11 December 2019
(This article belongs to the Special Issue Role of Magmatic Activity in Generation of Ore Deposits)
A suite of mafic intrusions, composed of diabase and micro-gabbro outcrops in the Jingxi area of southern Youjiang Basin, SW China. This study conducts geochronological, geochemical, and Sr–Nd isotopic analyses on the mafic intrusions in Jingxi with the aim of determining their petrogenesis, tectonic setting, and metallogenic implications. Zircon U–Pb dating for the mafic intrusions yielded an age of 183 ± 3 Ma (MSWD = 2.3), which is coeval with the Carlin-like gold mineralization in the Youjiang Basin. The mafic intrusions are alkaline in composition and characterized by low TiO2 (1.25–1.87 wt %) contents and low Ti/Y ratios (410–550). They exhibit OIB-like patterns of trace element distribution and they have low (87Sr/86Sr)i ratios of 0.704341 to 0.705677, slightly negative εNd(t) values of −0.30 to −2.16, low La/Ta (11.57–15.66) and La/Nb (0.77–1.06) ratios, with [La/Yb]N = 6.52–10.63. The geochemical characteristics, combined with regional considerations, suggest that the mafic intrusions originated from partial melting of upwelling asthenosphere within the garnet-spinel transition zone, as a result of intracontinental back-arc extension triggered by the steep subduction of the Paleo-Pacific plate beneath the South China Block. Moreover, the new data not only suggest Early Jurassic magma was a possible heat source, but also support a magmatism-related model for the Carlin-like gold mineralization in the Youjiang Basin. View Full-Text
Keywords: mafic rock; Carlin-like gold deposits; Youjiang Basin; intracontinental back-arc extension; geochemistry mafic rock; Carlin-like gold deposits; Youjiang Basin; intracontinental back-arc extension; geochemistry
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MDPI and ACS Style

Jiang, W.; Yan, Q.; Deng, L.; Zhou, B.; Xiang, Z.; Xia, W. Early Jurassic Mafic Intrusions in the Southern Youjiang Basin, SW China: Petrogenesis, Tectonic and Metallogenic Implications. Minerals 2019, 9, 771.

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