(1. 昆明理工大學(xué) 國土資源工程學(xué)院，昆明 650093；
2. 中國地質(zhì)科學(xué)院礦產(chǎn)資源研究所，北京 100037；
3. 中國科學(xué)院地質(zhì)與地球物理研究所，北京 100029；
4. 湖南有色黃沙坪礦業(yè)分公司，郴州 424421)
摘 要: 黃沙坪銅多金屬礦床位于湘南坪寶礦集區(qū)的南部，其深部的脈狀、不規(guī)則狀矽卡巖型銅多金屬礦體明顯受巖漿侵入接觸構(gòu)造的控制。隨著礦山的持續(xù)開發(fā)，黃沙坪銅多金屬礦床深部的保有資源日趨減少，亟待查明進(jìn)一步找礦方向。為此，本文對(duì)黃沙坪銅多金屬礦床深部的-256 m中段進(jìn)行構(gòu)造地球化學(xué)填圖，通過聚類分析、因子分析討論了地球化學(xué)元素的組合特征，繪制了構(gòu)造地球化學(xué)因子異常圖，判斷了成礦流體運(yùn)移方向，并進(jìn)行找礦預(yù)測。研究表明：黃沙坪銅多金屬礦床-256 m中段的礦體呈飄帶狀、不規(guī)則狀分布，其產(chǎn)出位置及形態(tài)嚴(yán)格受巖漿侵入接觸構(gòu)造及斷裂的控制。19#石門可劃分為弱方解石化灰?guī)r帶(Ⅰ)、大理巖帶(Ⅱ)、方解石化灰?guī)r帶(Ⅲ)、大理巖帶(Ⅳ)、透輝石石榴石矽卡巖化帶(Ⅴ)、花崗斑巖帶(Ⅵ)、透輝石矽卡巖帶(Ⅶ)、磁鐵礦礦體帶(Ⅷ)、透輝石矽卡巖帶(Ⅸ)、花崗斑巖帶(Ⅹ)、弱矽卡巖化花崗斑巖帶(Ⅺ)、矽卡巖帶(Ⅻ)。Pb、Zn、Ag、Au、W、Mo、Sn等成礦元素均在透輝石石榴石矽卡巖化帶(Ⅴ)、花崗斑巖帶(Ⅵ)中富集，微量元素在透輝石石榴石矽卡巖化帶(Ⅴ)中含量較高，指示矽卡巖化為區(qū)內(nèi)重要的找礦標(biāo)志。黃沙坪銅多金屬礦床-256 m中段構(gòu)造巖樣品的微量元素大致可分為高溫成礦元素組合、中-低溫成礦元素組合、巖體微量元素組合、圍巖微量元素組合；其中高溫成礦元素組合進(jìn)一步細(xì)分為與Au有關(guān)的高溫成礦元素組合、與Mo有關(guān)的高溫成礦元素組合。構(gòu)造地球化學(xué)異常的空間展布特征進(jìn)一步佐證，黃沙坪銅多金屬礦床存在Au-Cu-Pb-Zn、W-Sn-Mo-Bi兩套成礦系統(tǒng)，-256 m中段中部以石英斑巖體為中心，成礦流體向南南東、北西、南東方向運(yùn)移；而南部以花崗斑巖體為中心，成礦流體向北東、南西、北西三個(gè)方向運(yùn)移。依據(jù)構(gòu)造地球化學(xué)異常，本文圈定了2處重點(diǎn)找礦靶區(qū)。
關(guān)鍵字: 找礦預(yù)測；構(gòu)造地球化學(xué)；-256m中段；黃沙坪銅多金屬礦床；湘南
（1. Faculty of Land and Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China;
2. Chinese Academy of Geological Sciences, Beijing 100037, China;
3. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;
4. Hunan Nonferrous Huangshaping Mining Branch, Chenzhou 424421,China）
Abstract:The Huangshaping copper polymetallic deposit is located in the southern part of the Pingbao ore concentration area in Southern Hunan, China. Its deep veined and irregular skarn-type copper polymetallic ore bodies are obviously controlled by magmatic intrusive contact structures. Due to continuous development, the remaining resources in the deep part of Huangshaping copper polymetallic deposit are decreasing, and it is urgent to identify further prospecting directions. In this paper, the tectono-geochemistry mapping was carried out in the -256 m level tunnel of Huangshaping copper polymetallic deposit. The combination characteristics of geochemical elements were discussed by cluster analysis and factor analysis. The anomaly map of tectono-geochemistry factors was drawn. The migration direction of ore-forming fluid was judged and the prospecting prediction was made. The results show that the ore bodies in the -256 m level tunnel of the Huangshaping copper polymetallic deposit are distributed in a banded and irregular shape, and their occurrence location and shape are strictly controlled by magmatic intrusion contact structures and faults. The 19# exploration line of -256 m level tunnel can be divided into weak calcite limestone belt (Ⅰ), marble belt (Ⅱ), calcite limestone belt (Ⅲ), marble belt (Ⅳ), diopside garnet skarn belt (Ⅴ), granite porphyry belt (Ⅵ), diopside skarn belt (Ⅶ), magnetite ore body belt (Ⅷ), diopside skarn belt (Ⅸ), granite porphyry belt (Ⅹ), weak skarn granite porphyry belt (Ⅺ), and skarn belt (Ⅻ). Pb, Zn, Ag, Au, W, Mo, Sn and other ore-forming elements are enriched in diopside garnet skarn belt (Ⅴ) and granite porphyry belt (Ⅵ). The contents of trace elements in diopside garnet skarn zone (Ⅴ) are high, indicating important prospecting indicators in the area. The trace elements of tectonite samples in the -256 m level tunnel of Huangshaping copper polymetallic deposit can be roughly divided into high temperature metallogenic element combination, medium-low temperature metallogenic element combination, rock trace element combination and surrounding rock trace element combination. Among them, the high-temperature metallogenic element combination is further subdivided into the high-temperature metallogenic element combination related to Au and the high-temperature metallogenic element combination related to Mo. The spatial distribution characteristics of tectonogeochemical anomalies further support the existence of Au-Cu-Pb-Zn and W-Sn-Mo-Bi metallogenic systems in the Huangshaping copper polymetallic deposit. The -256 m level tunnel is centered on quartz porphyry, and the ore-forming fluid migrates to NW and SE. In the south, the granite porphyry as the center, the ore-forming fluid migrates to three directions of NE, SW, NW. Based on the tectonic geochemical anomalies, two key prospecting targets were delineated in this paper.
Key words: mineralization forecast; tectono-geochemistry; -256 m level tunnel; Huangshaping copper polymetallic deposit; Southern Hunan
