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改造强度是形成中国绿岩带及变质细碎屑岩系中大型及超大型金矿床的关键条件。以超大型金矿床的形成作用作为讨论对象,并对一些特大型金矿床形成超大规模的前景进行了评估。该类矿床产在变质岩及晚期侵入体中,矿床经历了沉积、区域变质及成矿等多次形成作用,有的还经历了重熔岩浆作用阶段,但矿床最终为改造作用所形成。控制超大型矿床成矿的改造作用强度主要反映在被活化的矿源岩石规模大并有多种来源、成矿流体规模大且具较强氧化性、流体长期多次活动以及有稳定的热源等。决定改造强度的因素为多级构造组成的连网。玲珑超大型金矿床是改造强度巨大的产物,形成金山及河台等矿床的改造强度也很巨大,因此有发展成为超大规模的潜力。
The intensity of reformation is a key condition for the formation of large-scale and super-large gold deposits in China’s greenstone belt and metamorphic fine clastic rock series. The formation of super-large gold deposits as a discussion object, and some super-large gold deposits formed on the prospect of large-scale assessment. This type of ore deposit is produced in metamorphic rocks and late intrusions. The deposits have undergone multiple formation processes such as sedimentation, regional metamorphism and metallogenesis, and some have undergone remelting magmatic stages, but the deposits eventually formed by the reformation. The intensity of the remodeling effect that controls the mineralization of very large deposits mainly reflects the large-scale and multiple sources of ore bodies that have been activated. The ore-forming fluid is large in scale and has strong oxidizing properties, long-term fluid activities and stable heat sources. The factors that determine the intensity of retrofit are the networking of multiple levels of construction. The exquisite super-large gold deposit is a product with great transformation intensity. The formation of the alteration strength of the deposits such as Jinshan and Hetai is also huge, so it has the potential to develop into a very large scale.