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新疆觉罗塔格地区自然铜矿化玄武岩沿着阿齐库都克深大断裂北侧分布,前人对其成岩年代一直存在争议。本文测得玄武岩条带中部的黑尖山玄武岩同岩浆期锆石SHRIMPU-Pb年龄为306.2±4.0Ma;测得东部东尖峰玄武岩的同岩浆期锆石LA-ICPMSU-Pb年龄为308.9±5.8Ma,确定了玄武岩是晚石炭世的岩浆作用,且归属于晚石炭世马头滩组。与觉罗塔格地区著名的晚石炭世-早二叠世铜镍矿化基性-超基性岩成因对比表明,该晚石炭世玄武岩与之具有共同岩浆源区特征,它们都是觉罗塔格地区晚石炭世-早二叠世岩石圈地幔深部受热熔融而形成岩浆作用。马头滩组玄武岩层是自然铜矿化的重要矿源层。
The natural copper mineralized basalts in the Jueluotage area of Xinjiang are distributed along the north side of the deep fault of Azikuduke, and the predecessors have been controversial about their diagenetic age. In this paper, the SHRIMPU-Pb zircon ages of the Blackjianshan basalts in the basalt belt are 306.2 ± 4.0Ma. The LA-ICPMSU-Pb ages of the zircons from the same east-sounder basalts are 308.9 ± 5.8Ma, It was confirmed that basalts are Late Carboniferous magmatism and belong to the Late Carboniferous Matoutan Formation. The comparison with the well-known Late Carboniferous-Early Permian Cu-Ni mineralization basic-ultrabasic rocks in Jueluotag area shows that the Late Carboniferous basalts shared the common magmatic source characteristics with them, The late Carboniferous-Early Permian lithospheric mantle in the Tagu area was heated and melted deep to form magmatism. Ma Tau Tan group basalt layer is an important source of natural mineralization of copper.