沉积地层中成矿作用的碳同位素特征和含矿缺氧盆地成因新观点

沉积盆地内地层中碳的来源，根据其碳，氧同位素特征可归纳为：海洋沉积碳酸盐碳，生物碳，热解非生物成因碳，大气淡水方解石碳和热卤水系统中的无机碳。热水成因的金矿及喷气－沉积矿床中的碳都具有深源成因的无机碳。深部含无机碳的热流体喷溢到海洋底部可以解释为扩张盆地底部形成的缺氧环境和含矿黑色页岩的主导原因。

Carbon isotope in sedimentary strata and new explanation for the origin of ore-bearing anoxic basins

The carbon in sedimentary basins may be derived from:(1)marine carbonates;(2) organic carbon;(3)abiogenetic carbon from thermal degradation;(4)carbon from meteoric calcite,and (5)inorganic carbon in the thermal brine systems.The carbon both in the hydrothermal gold deposits and hydrothermally exhalative-sedimentary deposits has a deep-seated origin.The processes of deep-seated inorganic carbon-bearing hydrothermal fluids spouting onto the sea floor may be interpreted to be the leading factors for the formation of anoxic environments and ore-bearing black shales at the bottom of extensional basins.