本文選題：天井鐵礦 + 礦床成因�。� 參考：《昆明理工大學(xué)》2015年碩士論文

【摘要】：云南省晉寧縣天井鐵礦床位于云南“山”字型構(gòu)造脊柱南端偏西與前弧相鄰部位,北起東山南至新龍?zhí)渡?正處于康滇地軸鐵礦帶上,成礦條件優(yōu)越。但由于對(duì)天井鐵礦床成礦背景、成礦機(jī)制的研究主要是在六七十年代進(jìn)行的,后人很少對(duì)其進(jìn)行剖析。所以天井鐵礦床的具體成因尚不清楚,迫切需要進(jìn)行分析,以便用理論支持深部找礦和區(qū)域找礦。本文綜合分析區(qū)域成礦背景,結(jié)合滇中鐵礦床的研究,對(duì)天井鐵礦床進(jìn)行了詳細(xì)解剖。通過礦床地質(zhì)調(diào)查、礦體形態(tài)描述、礦石特征總結(jié)、區(qū)域礦床對(duì)比等方面的研究,查明了其礦體分布特征、礦區(qū)容礦構(gòu)造、成礦物質(zhì)來源和大致的成礦年代,分析了天井鐵礦床的成礦特征及規(guī)律,探討了天井鐵礦床的成因。野外調(diào)查發(fā)現(xiàn),礦區(qū)主要出露中元古代昆陽群的美黨組、大龍口組地層,礦區(qū)構(gòu)造主要呈北東向展布。礦床由兩個(gè)主礦體及十多條次要礦體組成,礦體受地層、北東向斷裂及其次生斷裂控制。賦礦圍巖為大龍口組的灰?guī)r,成礦對(duì)圍巖的選擇性強(qiáng),礦體賦存于斷裂帶中,嚴(yán)格受地層、主干構(gòu)造及其次生構(gòu)造的控制,礦體呈南西—北東向展布,傾向以南東為主。礦床分為賦存于大龍口組灰?guī)r中的礦床和殘坡積礦�；�?guī)r中的礦床礦石以赤鐵礦為主,次為褐鐵礦,還有少量的纖鐵礦、針鐵礦、軟錳礦。脈石礦物以方解石、石英及白云石為主,有少量的絹云母和粘土礦物。原生礦石為赤鐵礦,之后風(fēng)化脫水形成褐鐵礦。殘坡積礦石基本為赤鐵礦、褐鐵礦碎塊和粉末,其品位和夾雜的粘土多少以及灰?guī)r中的礦體的距離有關(guān)。通過對(duì)天井鐵礦的區(qū)域地質(zhì)、礦床地質(zhì)特征等的分析,認(rèn)為礦區(qū)灰?guī)r中的礦床屬于中—低溫?zé)嵋撼涮罱淮丸F礦床,風(fēng)化剝蝕形成殘坡積礦床。最后通過對(duì)比研究,發(fā)現(xiàn)滇中地區(qū)與天井鐵礦床地質(zhì)特征基本相同的一系列鐵礦床,其礦床與天井鐵礦屬同一類型。最后依據(jù)分析總結(jié)的找礦標(biāo)志與野外勘查工作,為天井礦區(qū)下一步找礦粗略的指明了三個(gè)預(yù)測(cè)區(qū)。
[Abstract]:The Tianjing iron deposit in Jinning County, Yunnan Province is located in the south end of Yunnan's "mountain" type structure and adjacent to the front arc. It rises from Dongshan to Xinlongtan Mountain in the north and is located in the Kangdian axis iron ore belt, with favorable metallogenic conditions. However, because of the metallogenic background of the Liangjing iron deposit, the metallogenic mechanism was mainly studied in the 1960s and 1970s. Therefore, the cause of formation of the ore deposit in the courtyard is not clear, and it is urgent to analyze it in order to support the deep prospecting and regional prospecting with theory. In this paper, a comprehensive analysis of the regional metallogenic background, combined with the study of iron ore deposits in central Yunnan, the detailed anatomy of the iron ore deposits in the courtyard is carried out. Through the study of geological survey of ore deposit, description of ore body morphology, summary of ore characteristics and comparison of regional ore deposits, the distribution characteristics of orebody, ore-bearing structure, source of ore-forming material and approximate metallogenic age are found out. The metallogenic characteristics and rules of the iron ore deposit in the courtyard are analyzed, and the genesis of the ore deposit in the courtyard iron deposit is discussed. The field investigation shows that the strata of the Meidang formation and the Dalong mouth formation are mainly exposed in the middle Proterozoic Kunyang Group, and the structure of the mining area is mainly distributed in the north to east direction. The ore deposit is composed of two main orebodies and more than ten minor orebodies, which are controlled by strata, NE trending faults and their secondary faults. The ore-bearing surrounding rock is limestone of Dalong mouth formation, and its ore-forming selectivity is strong. The orebody occurs in the fault zone and is strictly controlled by strata, main structure and its secondary structure. The deposit can be divided into deposit and residual slope deposit in limestone of Dalong Kou formation. Hematite is the main ore in limestone, followed by limonite, and a small amount of pyrolusite, goethite and pyrolusite. Gangue minerals are mainly calcite quartz and dolomite with a small amount of sericite and clay minerals. The primary ore is hematite and then weathered and dehydrated to form limonite. The residual slope product ore is basically hematite, limonite fragment and powder, its grade is related to the amount of clay and the distance of ore body in limestone. Based on the analysis of the regional geology and geological characteristics of the Liangjing iron deposit, it is considered that the deposit in limestone belongs to the intermediate-low temperature hydrothermal filling metasomatic iron deposit, and weathering denudation forms the residual slope deposit. Finally, a series of iron ore deposits with the same geological characteristics are found in the central Yunnan area, and the ore deposits belong to the same type as the patio iron ore deposits. Finally, based on the analysis and summary of the prospecting criteria and field exploration work, three prediction areas are roughly indicated for the next prospecting in the patio mine area.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.31

【引證文獻(xiàn)】

相關(guān)會(huì)議論文 前1條

1 常向陽;朱炳泉;董云鵬;;滇中元古宙銅礦帶地質(zhì)背景與地球化學(xué)急變帶[A];第四屆全國(guó)青年地質(zhì)工作者學(xué)術(shù)討論會(huì)論文集[C];1999年

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本文編號(hào)：1979009