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川南普格杏仁状玄武岩中普遍产出沥青和铜矿物。沥青主要产于玄武岩气孔、晶洞和裂隙中,少量产于水晶晶体的锥状体部位。铜矿物主要有自然铜、赤铜矿、黑铜矿、硅孔雀石和孔雀石等。自然铜可形成完整晶体,分布于水晶菱面体的锥体顶部,也可呈它形粒状或片状,分布于杏仁体、脉状体沥青的裂隙中和铜球粒核部;赤铜矿主要与板状自然铜一起分布于石英或玉髓脉的裂隙中;黑铜矿常与自然铜一起产出于裂隙或铜球粒中;硅孔雀石呈脉状、浸染状、网状分布在沥青中及其裂隙中,部分硅孔雀石呈皮壳状赋存在自然铜、水晶晶体表面和铜球粒表面;而孔雀石主要分布于铜球粒的最外圈。沥青与铜矿物形成次序为:沥青→自然铜→赤铜矿→黑铜矿→硅孔雀石→孔雀石。沥青和自然铜形成于水晶结晶作用晚期,自然铜形成于沥青之后。碳同位素研究显示沥青为生物成因,可能来源于下二叠统(P13)的碳酸盐岩中的生油层;沥青的红外光谱及螺旋生长纹与气孔构造也证实沥青是由成矿热液中的原油受热裂解为固相;成矿溶液中的有机质成熟度越髙,成矿溶液析出的自然铜越多;铜矿物的演化(Cu→Cu2+)与含有机质的成矿溶液的氧化还原条件及成分变化密切相关。
Pitch almond-like basalt in Sichuan Province generally produces bitumen and copper minerals. Bitumen is mainly produced in basaltic pores, caves and fissures, a small amount of crystal produced in the conical body parts. Copper minerals are mainly natural copper, red copper, black copper, silicon malachite and malachite. Natural copper can form a complete crystal, distributed in the top of the rhombus crystal rhombus, but also was it granular or flaky shape, distributed in the amygdala, veins and veins in the fissure of the nucleus copper; And plate-like natural copper are distributed in the cracks of quartz or chalcedony veins; black copper ore is often produced together with natural copper in fissures or copper spherules; and silicon malachite is veined, disseminated and reticulated in bitumen In the middle part and its fissures, part of the malachite remains in a hull form on the surface of natural copper, crystal and copper pellets. Malachite is mainly distributed on the outermost part of the copper pellets. Asphalt and copper mineral formation order: bitumen → natural copper → copper red copper ore → → → Malachite Malachite. Bitumen and natural copper are formed during the late crystallization of crystals, and natural copper forms behind the bitumen. Carbon isotope studies have shown that bitumen is a biogenic cause that may originate from carbonate reservoirs in the Lower Permian (P13); infrared spectra of bitumen and spiral growth patterns and stomatal structures also confirm that bitumen is formed from hydrothermal fluids Of the crude oil pyrolyzed into solid phase. The more mature the organic matter in the ore-forming solution is, the more natural copper will be precipitated from the ore-forming solution. The redox conditions of Cu ¢ ó Cu2 + and the ore-forming solution containing organic matter And composition changes are closely related.