摘要
杉树林铅锌矿床矿体呈似层状和透镜状成群分布在中石炭统黄龙群(C_2hn^(2a))中,含矿层属碳酸盐台盆相,先沉积矿源层后发生浊流沉积。浊积岩中有完整的鲍马序列,其可分为盆地边缘相;斜坡滑动相;流动相和前锋相。在σ_i—Mz图,σ_i—Ski图、σ_i—K_G图和C—M图上的颗粒分布均显示浊积岩特征。据萨胡判别式,该区87％的Y值符合浊积岩条件。突发的浊流沉积推济破坏矿源层的连续性,使矿体沿走向成群分布并向东南侧伏,矿石具有被扰动的纹层构造。本区浊积岩可称为“碳酸盐滑动浊积岩”。浊流前锋相控制了矿化体分布,在1400m标高以下,可能有3个新的矿化体。
The ore bodies of the Shashulin Pb-Zn deposit occurred in the stratoidand lens-like form in groups within Middle Carboniferous HuanglongFormation (C_2hn^(2a)), and the ore-bearing beds belong to carbonate platform-basin facics, having the source beds formed the turbidity current bapped.The turbidites include perfect Bouma sequences and can be divided intofollowing four facies: the marginal basin facies, the slope slide facies,the current facies and the front facies. On the basis of grain analysis, inthe diagram of σ_i-Mz, σ_i-Ski, σ_i-K_G and C-M, the grain distribution showsturbidite feature. The grain statistic 87 percent meet the turbidite conditionaccording to Sahu formula. The abrupt turbidity current pushed anddistroyed the successive source beds, so that ore bodies should bedistributed in groups along the strike and plunged to southeast. Theturbidite inay be called carbonate slide turbidite/. The ore bodies arecontrolled by front facies of turbidite, and below 1400m altitude the threehopeful new ore bodies may be discovered.
基金
中国有色金属工业总公司"七五"科研项目(89-D-21)
关键词
铅锌矿床
碳酸盐岩
浊流
沉积
成矿
lead-zine deposit
mineralization
carbonate turbidite
turbidity current
Guizhou
