本文選題：重晶石礦床　切入點(diǎn)：地質(zhì)特征　出處：《地球化學(xué)》2017年05期 　論文類型：期刊論文

【摘要】：對(duì)黔南泥盆系重晶石礦床的產(chǎn)出地質(zhì)背景、礦床地質(zhì)和同位素地球化學(xué)特征進(jìn)行了綜合分析,總結(jié)了重晶石礦床空間分布特征和成礦規(guī)律,指出了可能的成礦遠(yuǎn)景區(qū)。重晶石礦床空間展布形態(tài)及產(chǎn)出特征受北西向區(qū)域性深大斷裂控制明顯,礦體呈北西向沿褶皺或次級(jí)斷裂分布。礦石結(jié)構(gòu)、構(gòu)造類型在樂(lè)紀(jì)礦段最為多樣,包括紋層狀、條帶狀、塊狀、碎屑狀和角礫狀構(gòu)造,且礦體厚度最大,約10 m;向東部羅城礦段過(guò)渡,礦石構(gòu)造類型主要以紋層狀和塊狀構(gòu)造為主,礦體厚度迅速減薄或尖滅。礦石S同位素組成從樂(lè)紀(jì)至羅城,δ~(34)S值由+68.4‰迅速降低至+27.6‰,指示樂(lè)紀(jì)地區(qū)相比羅城一帶,可能處于更深水的局限環(huán)境,硫酸鹽還原細(xì)菌作用更加強(qiáng)烈。重晶石礦體中與古甲烷滲漏事件有關(guān)的球狀灰?guī)r,其δ~(13)C值在樂(lè)紀(jì)礦段表現(xiàn)最負(fù),為 10.27‰,羅城礦段灰?guī)rδ~(13)C值逐漸偏正,達(dá)到+0.03‰,說(shuō)明古甲烷滲漏活動(dòng)在樂(lè)紀(jì)礦段表現(xiàn)更劇烈,強(qiáng)烈的滲漏事件為形成厚度約10 m的重晶石礦體提供了充足的物質(zhì)保障。鎮(zhèn)寧樂(lè)紀(jì)地區(qū)很可能是重晶石成礦的中心,向東部羅城一帶過(guò)渡,逐漸遠(yuǎn)離成礦中心,成礦物質(zhì)供應(yīng)匱乏,不易形成具有經(jīng)濟(jì)價(jià)值的工業(yè)重晶石礦體。此外,應(yīng)重視并加強(qiáng)樂(lè)紀(jì)以西地區(qū)重晶石找礦勘查工作,重點(diǎn)是尋找北西向斷裂或褶皺構(gòu)造發(fā)育地區(qū),重晶石成礦條件相比更加優(yōu)越,易在隱伏重晶石礦床找礦方面取得新突破。
[Abstract]:The occurrence geological background, geological and isotopic geochemical characteristics of Devonian barite deposits in southern Guizhou are comprehensively analyzed, and the spatial distribution and metallogenic regularity of barite deposits are summarized. It is pointed out that the spatial distribution and occurrence characteristics of barite deposits are obviously controlled by the regional deep and large faults in the NW direction, and the orebodies are distributed in the NW direction along the fold or secondary faults. The structural types are the most varied in the Lele formation, including lamellar, banded, massive, clastic and breccia structures, and the orebody is the largest in thickness, about 10 m. The ore tectonics mainly consist of lamellar and massive structures, the thickness of ore bodies is thinning or sharp out rapidly. The S isotopic composition of ore is rapidly reduced from Lele to Luocheng, and the S value of 未 ~ (34) is reduced from 68.4 鈥，

本文編號(hào)：1618895