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沉积岩系
sedimentary rocks
- 它们属于还原环境形成的黑色沉积岩系。
They belong to the black sedimentary rocks formed in a reducing environment. - 矿石与盆地的中新生界沉积岩系的铅同位素组成相似。
The Pb isotopic composition of the ore is similar to that of Mesozoic_Cenozoic sedimentary rocks in this basin. - 成岩物质主要来自深部地壳同熔岩浆，有部分火山-沉积岩系的同化重熔物质加入。
Their rock-forming substances are predominantly derived from syntectic magma of the deep crust with the addition of some assimilationary-remelting substances of volcanic-sedimentary rocks.
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