Geochronology and petrogenesis of Triassic low‐Ti mafic intrusions in Funing: Implications for the tectonic evolution of Nanpanjiang Basin, SW China

2021 ◽  
Vol 56 (10) ◽  
pp. 5235-5254
Author(s):  
Wen Jiang ◽  
Quanren Yan ◽  
Wenjing Xia ◽  
Li Deng
Keyword(s):  
Tectonic Evolution ◽  
Sw China ◽  
Mafic Intrusions

Late Paleoproterozoic to early Mesoproterozoic Dongchuan Group in Yunnan, SW China: Implications for tectonic evolution of the Yangtze Block

2010 ◽  
Vol 182 (1-2) ◽  
pp. 57-69 ◽  
Author(s):  
Xin-Fu Zhao ◽  
Mei-Fu Zhou ◽  
Jian-Wei Li ◽  
Min Sun ◽  
Jian-Feng Gao ◽  
...  
Keyword(s):  
Tectonic Evolution ◽  
Yangtze Block ◽  
Sw China

The Yinachang Fe-Cu-Au-U-REE deposit and its relationship with intermediate to mafic intrusions, SW China: Implications for ore genesis and geodynamic setting

2019 ◽  
Vol 104 ◽  
pp. 190-207 ◽  
Author(s):  
Ligang Zhu ◽  
Jiajun Liu ◽  
Leon Bagas ◽  
Emmanuel John M. Carranza ◽  
Degao Zhai ◽  
...  
Keyword(s):  
Geodynamic Setting ◽  
Ore Genesis ◽  
Sw China ◽  
Mafic Intrusions

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

Minerals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 771 ◽  
Author(s):  
Wen Jiang ◽  
Quanren Yan ◽  
Li Deng ◽  
Bin Zhou ◽  
Zhongjin Xiang ◽  
...  
Keyword(s):  
Gold Mineralization ◽  
Tectonic Setting ◽  
Element Distribution ◽  
Early Jurassic ◽  
Trace Element Distribution ◽  
Sw China ◽  
Mafic Intrusions ◽  
Isotopic Analyses ◽  
Youjiang Basin ◽  
Back Arc

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.

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