本文選題：成礦環(huán)境 + 古地理環(huán)境　； 參考：《吉林大學(xué)學(xué)報(bào)(地球科學(xué)版)》2017年02期

【摘要】：牛角塘伴生型鎘礦床鎘的富集程度高,比克拉克值高4~5個(gè)數(shù)量級(jí),比工業(yè)品位高十幾倍至上百倍。早寒武世清虛洞期牛角塘地區(qū)處于臺(tái)緣灘丘環(huán)境,在清虛洞組中上部形成了藻丘建造,發(fā)育了含藻類(lèi)、藻球粒、藻鮞粒、核形石和生物碎屑的白云巖,是該礦床最主要的容礦巖性單元。礦體普遍呈似層狀、透鏡狀和脈狀產(chǎn)出,礦體產(chǎn)狀與容礦圍巖的產(chǎn)狀基本一致,礦體的分布受清虛洞組藻丘建造以及有利巖性組合的聯(lián)合控制,具明顯的層控、相控、巖控的特點(diǎn)。藻丘建造還可能提供了部分礦源。鎘的超常富集、成礦與麻江古油藏的成藏演化具有一定的關(guān)系:一是牛角塘礦床成礦年齡為433~510 Ma,即加里東運(yùn)動(dòng)的中晚期,而加里東運(yùn)動(dòng)中晚期是麻江古油藏的油氣活動(dòng)時(shí)期,麻江古油藏的早期演化階段與牛角塘鎘礦的成礦期大體是重合的,成藏應(yīng)略早于成礦,成礦是在古油藏液態(tài)烴仍然存在的情況下進(jìn)行的,且成礦期有可能一直延伸至油藏被破壞以后;二是油藏流體為成礦提供具還原性質(zhì)的成礦流體和部分硫源。特殊的巖相古地理環(huán)境和古油藏為牛角塘礦床鎘的富集和成礦提供了有利條件。
[Abstract]:The enrichment degree of cadmium in Nijiaotang associated cadmium deposit is high, which is 4 ~ 5 orders of magnitude higher than Clark value and 10 to 100 times higher than industrial grade. The Niujiaotang area in the early Cambrian Qingxuxudong period was in the platform margin beach and mound environment. In the middle and upper part of the Qingxudong formation, algal dune formation was formed, and dolomite containing algae, algal globules, algal oolitic grains, nuclear rocks and bioclastic rocks were developed. Is the most important ore-bearing unit of the deposit. The orebodies are generally stratiform, lenticular and vein-like, and the occurrence of orebodies is basically the same as that of the host rock. The distribution of orebodies is controlled by the algal dune formation of Qingxuxudong formation and the favorable lithologic assemblage, which is controlled by obvious stratification and facies control. The characteristics of rock control. Algae-dune construction may also provide part of the mineral resources. The supernormal enrichment of cadmium has a certain relationship with the evolution of Majiang paleoreservoir: first, the metallogenic age of Niujiantang deposit is 433510Ma, that is, the middle and late Caledonian movement is the period of oil and gas activity of Majiang paleoreservoir, and the middle and late Caledonian movement is the period of oil and gas activity in Majiang paleoreservoir. The early evolution stage of Majiang paleoreservoir coincides with the metallogenic stage of Niujiantang cadmium deposit, and the reservoir formation should be slightly earlier than the metallogenic stage, and the mineralization is carried out under the condition that the liquid hydrocarbon still exists in the paleo-reservoir. The ore-forming period may extend until the reservoir is destroyed, and the reservoir fluid can provide the ore-forming fluid and some sulfur source with reductive property for metallogeny. The special lithofacies paleogeographic environment and paleoreservoir provide favorable conditions for cadmium enrichment and mineralization in Niujiantang deposit.
【作者單位】： 中國(guó)石油遼河油田公司;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(49633110)~~
【分類(lèi)號(hào)】：P618.81

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