临沧超大型锗矿床有机质与锗矿化的地球化学特征

临沧锗矿床是一产于第三系含煤岩系中的超大型矿床。矿床的最初锗源与盆地西缘的二云母花岗岩有关。主矿体产于下煤组沉积旋回的早期地层中，每一沉积阶段早期形成的褐煤和碳质泥岩中富含锗，最高含量达１４７０×１０＾－６。褐煤和碳质泥岩在矿化过程中平均富集了１６４－１６９倍。根据锗含量，褐煤和碳质泥岩可分为锗含量小于１２×１０＾－６的低锗煤（泥岩）和大于９０×１０＾－６的高锗煤（泥岩）。高锗煤中有机质富含氧官能

SOME CHARACTERISTICS OF ORGANIC MATTER ANDMINERALIZATION OF LINCANG SUPER-LARGE GERMANIUMDEPOSIT IN YUNNAN PROVINCE,CHINA

Lincang germanium deposit is a super-large deposit hosted by Terdary coal-bearing series in the Bangmai basin in Yuanan Province, China. The initial source of Ge was related to two-mica granite rounding the basin and the granite contains about 3.5 x 10-6 of Ge .The main orebodies occur within the strata which formed in early stage of the sedimentation cycle . Only those lignite and carbargilite, which formed early in every sedimentation stage and located in the westem edge of the basin, are rich in Ge. The maximum content of Ge is up to 1470 x 10-6 in lignite. The statistics show that the mineralization process made Ge-contents of lignite and carbargilite 164 and 169 times higher than that of background, respectively. In this paper lignite (carbargilite) has been , divided into Ge-rich type, which contains Ge more than 90x 10-6, and Ge-poor type, which contains Ge less than 12 x 10 -6. There are evident differences between Ge- rich and Ge-poor lignite (carbargilite ) in composition of organic and characteristics of mineralization The Ge - rich lignites are characterized by enrichment of corpohuminite, alginite, and sclerodnite and by lack of humotelinite and gelinite. Organic matters in Ge-rich lignites are relatively humic and chemically rich in oxygen-containing groups.