南秦嶺鋇成礦帶鋇礦床物質(zhì)組成及毒重石成因研究
發(fā)布時間：2018-07-22 10:44
【摘要】：南秦嶺大巴山地區(qū)發(fā)育了世界上極為罕見的大型鋇成礦帶。該成礦帶鋇礦物種類十分豐富。通過對南秦嶺鋇成礦帶鋇礦床的電子探針研究,并結(jié)合前人研究成果,發(fā)現(xiàn)南秦嶺大型鋇成礦帶中鋇主要以重晶石、毒重石、鋇解石、菱鋇鎂石、鋇長石、漢江石、安康礦、鋇冰長石、含鋇釩云母等形式存在;硫化物以黃鐵礦、閃鋅礦為主,并含有少量的針鎳礦、硫釩銅礦、藍(lán)輝銅礦、斑銅礦、黃銅礦。此外,還發(fā)現(xiàn)少量釩鈦氧化物。毒重石中的C主要來源于有機質(zhì),且δ13C值為-10.9‰~-21.0‰,與TSR成因的δ13C值相匹配;Sr同位素研究表明毒重石在形成過程中有富含貧放射性成因鍶的熱水加入;根據(jù)Sr同位素計算的鹽度值較流體包裹體計算的鹽度值高,表明毒重石的形成過程中混合水體鹽度降低,暗示毒重石形成過程中可能有水生成;毒重石的包裹體均一溫度結(jié)果顯示,毒重石的形成溫度介于118~303.7℃,有利于TSR的發(fā)生。此外,鋇成礦帶中的硫化物種類及S同位素研究結(jié)果也均與TSR相符合。根據(jù)毒重石的C同位素、Sr同位素、包裹體溫度及毒重石成礦亞帶的重晶石集硫化物的S同位素研究結(jié)果,表明毒重石的形成于熱化學(xué)硫酸鹽還原作用(TSR)相關(guān)。賦礦圍巖及鋇礦石的巖石地球化學(xué)特征表明:硅質(zhì)巖主要形成于深海-半深海的缺氧環(huán)境,具有熱液和生物混合成因的特點;鋇礦石及圍巖的Th/U值介于0~2之間,δU值1,表明鋇礦石及賦礦圍巖形成于缺氧環(huán)境。鋇礦石及賦礦圍巖圍巖中Mo與U、V、Cr呈良好的正相關(guān)關(guān)系,表明當(dāng)時鋇礦石及圍巖的形成環(huán)境為與海底水體的還原環(huán)境相一致。賦礦圍巖具有較高的(U+V)/(U+V+Mo)值和Mo含量,暗示了賦礦圍巖的沉積環(huán)境為極其還原環(huán)境甚至可能出現(xiàn)硫化的還原環(huán)境;重晶石成礦亞帶中鋇礦石中(U+V)/(U+V+Mo)值較高,而Mo含量較低,表明其在富集V和U時,并不富集Mo元素,暗示了重晶石成礦亞帶的沉積環(huán)境為亞氧化-還原的沉積環(huán)境;毒重石成礦亞帶中鋇礦石的(U+V)/(U+V+Mo)值較高,而Mo含量也相對較高,暗示了毒重石成礦亞帶的沉積環(huán)境為極其還原環(huán)境,表明毒重石成礦亞帶的沉積環(huán)境較重晶石成礦亞帶更為還原;賦礦圍巖中Mo含量較鋇礦石高,說明圍巖的形成環(huán)境較鋇礦石更為還原。
[Abstract]:A rare large barium metallogenic belt in the Dabashan area of southern Qinling Mountains has been developed. The variety of barium minerals in this metallogenic belt is very rich. Through the study of the electron probe of barium deposits in the southern Qinling Mountains barium metallogenic belt and the previous research results, it is found that barium in the large barium metallogenic belt in southern Qinling Mountains is mainly barite, poisonous stone, barium Dite, barium, barium and barium. Feldspar, Hanjiang stone, Ankang ore, barium feldspar and barium vanadium feldspar exist in the form of barium vanadium mica; sulfide is mainly pyrite and sphalerite, and contains a small amount of nickel ore, sulphur vanadium copper mine, blue chalcopyrite, chalcopyrite and chalcopyrite. In addition, a small amount of vanadium and titanium oxide is found. The C is mainly derived from organic matter, and the delta 13C value is -10.9 per thousand ~-21.0 per thousand, and TS The delta 13C value of R is matched, and the Sr isotope study shows that there is a hot water rich in strontium rich in radioactive origin in the formation process; the salinity calculated according to the Sr isotope is higher than that calculated by the fluid inclusion, indicating that the salinity of the mixed water is reduced during the formation of the poisonous stone, suggesting that there may be water in the formation of the poisonous stone. The homogenization temperature of the inclusions showed that the formation temperature of the poison stone was between 118~303.7 C and TSR. In addition, the sulphide species and S isotopes in the barium metallogenic belt were consistent with the TSR. According to the C isotopes, Sr isotopes, the inclusions temperature and the barite in the metallogenic subzone of the poison heavy stone The results of S isotopic study of sulphide show that the formation of toxic rocks is related to thermo chemical sulfate reduction (TSR). The geochemical characteristics of ore bearing surrounding rock and barium ore show that the siliceous rocks are mainly formed in the anoxic environment of deep sea and semi deep sea, with the characteristics of hydrothermal and biological mixed synthesis, and the Th/U value of barium ore and surrounding rock is between 0. Between ~2, Delta U value 1, indicating that barium ore and ore bearing surrounding rock formed in anoxic environment. Mo and U, V, Cr in barium ore and surrounding rock are positive correlation, indicating that the formation environment of barium ore and surrounding rock was consistent with the reduction environment of sea water body. The ore bearing surrounding rock has a high (U+V) / (U+V+Mo) value and Mo content, suggesting the Fu. The sedimentary environment of the surrounding rock is an extremely reduced environment or even the reduction environment that may be vulcanized; the barium ore (U+V) / (U+V+Mo) in the barite metallogenic subzone is higher, and the Mo content is low, indicating that the concentration of V and U does not enrich the Mo element, suggesting that the sedimentary environment of the barite metallogenic subzone is a suboxidation reduction sedimentary environment; The barium ore (U+V) / (U+V+Mo) value of the stone metallogenic subzone is higher and the Mo content is relatively high, suggesting that the sedimentary environment of the metallogenic subzone of the poison heavy stone is extremely reducing environment, which indicates that the sedimentary environment of the toxic heavy stone metallogenic subzone is more reductive than the barite metallogenic subzone, and the Mo content in the surrounding rock is higher than the barium ore, indicating that the surrounding rock formation environment is barium. The ore is more reductive.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P619.2
[Abstract]:A rare large barium metallogenic belt in the Dabashan area of southern Qinling Mountains has been developed. The variety of barium minerals in this metallogenic belt is very rich. Through the study of the electron probe of barium deposits in the southern Qinling Mountains barium metallogenic belt and the previous research results, it is found that barium in the large barium metallogenic belt in southern Qinling Mountains is mainly barite, poisonous stone, barium Dite, barium, barium and barium. Feldspar, Hanjiang stone, Ankang ore, barium feldspar and barium vanadium feldspar exist in the form of barium vanadium mica; sulfide is mainly pyrite and sphalerite, and contains a small amount of nickel ore, sulphur vanadium copper mine, blue chalcopyrite, chalcopyrite and chalcopyrite. In addition, a small amount of vanadium and titanium oxide is found. The C is mainly derived from organic matter, and the delta 13C value is -10.9 per thousand ~-21.0 per thousand, and TS The delta 13C value of R is matched, and the Sr isotope study shows that there is a hot water rich in strontium rich in radioactive origin in the formation process; the salinity calculated according to the Sr isotope is higher than that calculated by the fluid inclusion, indicating that the salinity of the mixed water is reduced during the formation of the poisonous stone, suggesting that there may be water in the formation of the poisonous stone. The homogenization temperature of the inclusions showed that the formation temperature of the poison stone was between 118~303.7 C and TSR. In addition, the sulphide species and S isotopes in the barium metallogenic belt were consistent with the TSR. According to the C isotopes, Sr isotopes, the inclusions temperature and the barite in the metallogenic subzone of the poison heavy stone The results of S isotopic study of sulphide show that the formation of toxic rocks is related to thermo chemical sulfate reduction (TSR). The geochemical characteristics of ore bearing surrounding rock and barium ore show that the siliceous rocks are mainly formed in the anoxic environment of deep sea and semi deep sea, with the characteristics of hydrothermal and biological mixed synthesis, and the Th/U value of barium ore and surrounding rock is between 0. Between ~2, Delta U value 1, indicating that barium ore and ore bearing surrounding rock formed in anoxic environment. Mo and U, V, Cr in barium ore and surrounding rock are positive correlation, indicating that the formation environment of barium ore and surrounding rock was consistent with the reduction environment of sea water body. The ore bearing surrounding rock has a high (U+V) / (U+V+Mo) value and Mo content, suggesting the Fu. The sedimentary environment of the surrounding rock is an extremely reduced environment or even the reduction environment that may be vulcanized; the barium ore (U+V) / (U+V+Mo) in the barite metallogenic subzone is higher, and the Mo content is low, indicating that the concentration of V and U does not enrich the Mo element, suggesting that the sedimentary environment of the barite metallogenic subzone is a suboxidation reduction sedimentary environment; The barium ore (U+V) / (U+V+Mo) value of the stone metallogenic subzone is higher and the Mo content is relatively high, suggesting that the sedimentary environment of the metallogenic subzone of the poison heavy stone is extremely reducing environment, which indicates that the sedimentary environment of the toxic heavy stone metallogenic subzone is more reductive than the barite metallogenic subzone, and the Mo content in the surrounding rock is higher than the barium ore, indicating that the surrounding rock formation environment is barium. The ore is more reductive.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P619.2
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
1 姚書振,丁振舉,周宗桂,陳守余;秦嶺造山帶金屬成礦系統(tǒng)[J];地球科學(xué);2002年05期
2 K.W.Murray ,R.B.Brink ,董維全 ,張倩;美國加利福尼亞州弗朗西斯雜巖和蒙特雷群中燧石的稀土元素、主元素和微量元素:海相細(xì)粒沉積物中稀土元素來源的確定[J];地質(zhì)地球化學(xué);1993年03期
3 毛景文,李曉峰,李厚民,曲曉明,張長青,薛春紀(jì),王志良,余金杰,張作衡,豐成友,王瑞廷;中國造山帶內(nèi)生金屬礦床類型、特點和成礦過程探討[J];地質(zhì)學(xué)報;2005年03期
4 李永峰,毛景文,胡華斌,郭保健,白鳳軍;東秦嶺鉬礦類型、特征、成礦時代及其地球動力學(xué)背景[J];礦床地質(zhì);2005年03期
5 吳勝華;劉家軍;翟德高;;陜西紫陽黃柏樹灣鋇礦床成礦流體地球化學(xué)特征[J];礦床地質(zhì);2010年S1期
6 周強強;胡文潔;;Sr同位素的研究現(xiàn)狀和最新進(jìn)展[J];科技信息;2012年01期
7 劉方杰,方維萱,郭健;地幔柱/熱點成礦作用與秦嶺造山帶金屬成礦[J];礦物巖石地球化學(xué)通報;2000年04期
8 朱賴民;張國偉;李r，
本文編號：2137185
本文鏈接：http://sikaile.net/kejilunwen/diqiudizhi/2137185.html
最近更新
教材專著
