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Ore-forming Material Sources and Sedimentary-reworked Metallization of Huize Super-large Lead-Zine Deposits in Northeastern Yunnan, China
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2017, 23(4):
563.
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The theory of reworked metallization is a new theory to optimize the quartering method of genetic classification of mineral
deposits. It is proposed by Chinese scientist Prof. Tu Guangzhi, and is a great contribution to earth sciences in the world from Chinese
scholar. This article applies the theory of reworked metallization to examine the genesis of Huize super large Pb-Zn deposit. Based on
the geological and geochemical characteristics, we suggest that it is a typical and special sedimentary-strongly reworked deposit. On the
basis of macroscopic phenomena, there are no significant Pb-Zn deposits in the Emeishan Basalts （260 Ma） and Kunyang folded
basement. It is believed that basalts and basement cannot provide the ore-forming material sources. Meanwhile, the metallogenetic fault
cuts through the basalts, indicating that basalts formed prior to metallization and basaltic magma is not the mineralization factor. Theare various opinions on the ore genesis and ore-forming material sources, such as strata source, basement source, basalt source, and
multi-source. However, so far there is still no deep insight into the primary source of the ore-forming material, and it is controversial
whether multi-metals have unique source. In this paper, we systemically calculate and analyze the content, enrichment coefficient, and
enrichment type of ore-forming elements in the strata, basement, and Emeishan basalt to discuss the possible sources of all kinds of
ore-forming metals and estimate its contribution to the mineralization. Results show that Silver is high in geological units everywhere, Pb
comes second; while on the contrast, Zn, Ge, Ga, and In are normal or depleted elements. So the Zn, Ge, Ga, and In of the ore are more
likely come from the deep. Based on the geochemical data of trace and rare earth elements, Pb, S, Sr, C, H, O isotopes, we conclude that
the Z, , D, C strata and deep are the main ore-forming material sources and multi-metals may have same or different sources. The
deposit is controlled by stratigraphic lithology and tectonics, but has no direct relationship with magma. The deposit shows features of
reworked metallization and belongs to the strongly reworked sedimentary deposit which is characterized by very high grade of the ore,
more associated metals, and super-large size. The stratified ore-bodies or source bed formed in Hercynian, and abnormal enrichment
occurred during the later Indosinian movement. We called it“Huizetype”sedimentary-reworked deposit.
