【正文】 g conditions and semiclosed environment, temperature, pressure drop is slow, is advantageous to the metasomatism of thorough and high sulfur and low oxygen and the formation of mineral ore body in extensional space positioning. To sum up, the Triassic turbidite rock formed by the deposition of construction, is a kind of gold bearing geological formation, mainly in the form of adsorption exists in most of the gold to be released (active) gold, lay the ground for mineralization. 。 Sandy unit mon ditch at the bottom of the die, die structure。綜上所述，三疊紀(jì)沉積作用所形成的濁積巖建造，是一種含金地質(zhì)建造，主要以吸附形式存在于其中的金大多為可釋放 (活性 )金，為成礦奠定了豐富的物質(zhì)基礎(chǔ)。大場(chǎng)微細(xì)粒浸染型金礦所反映的中低溫礦化與巖體和巖脈的某種空間聯(lián)系，實(shí)際就是這種熱場(chǎng)的反映。以各種絡(luò)離子形式存在于水體中的金，易于被有機(jī)碳或者泥質(zhì)所吸附。發(fā)育微波狀層理 。大場(chǎng)礦區(qū) 4件黃鐵礦樣品的 206Pb/204Pb，比值為 — ，平均值為； 207Pb/204Pb，為 ，平均 值為 ； 208Pb/204為 — ，平均值為 38. 2918，是典型的異常鉛。礦床特征元素組合為 Hg As Sb一 Au, Au 與 Hg,As,Sb，通常成正相關(guān)，平面上 Sb ,Au異常往往被包于 Hg,As異常之內(nèi)，具低溫元素組合特征。中文 2600 字 引 言 大場(chǎng)金礦是青海省北巴顏喀拉地區(qū)“十五”期間發(fā)現(xiàn)的大型金礦床，位于青海省玉樹藏族自治州曲麻萊縣瑪多鄉(xiāng)北部，大地構(gòu)造位置處于巴顏喀拉印支期造山帶北側(cè)，北以布青山南坡斷裂為界與阿尼瑪卿縫合帶毗鄰。礦石礦物主要為黃鐵礦和毒砂，脈石礦物 主要為石英、方解石，載金礦物主要為熱液黃鐵礦和毒砂，金呈分散狀態(tài)賦存在兩礦物的晶粒內(nèi)，無明顯的集中分布區(qū)。流體不混溶作用發(fā)生于 236℃一 275℃，經(jīng)流體不混溶液作用分離出的 CO2 H20流體和 NaCl H20流體是主要的金成礦流體。砂質(zhì)單元底部常見溝模、槽模等構(gòu)造 。眾所周知， Au是一種變價(jià)元素，具有與 S,O,C,H,As 等許多元素結(jié)合成簡(jiǎn)單或復(fù)雜絡(luò) 合物的能力，在地球化學(xué)行為上，既有親硫性和親鐵性，又有親碳性。 巖漿活動(dòng) :區(qū)內(nèi)石英脈十分發(fā)育，東部出露印支燕山期花崗巖，它們?cè)谇秩牒蟮南喈?dāng)長(zhǎng)的時(shí)間內(nèi)所產(chǎn)生的熱效應(yīng)，必然導(dǎo)致一定范圍內(nèi)熱異常的出現(xiàn)。旁側(cè)次級(jí)壓扭性斷裂，能造成良好的屏蔽條件和半封閉環(huán)境，溫度、壓力下降緩慢，有利于交代作用的充分進(jìn)行和高硫低氧型礦質(zhì)的形成，在張性空間礦體定位。 Contain pyrite, galena, quartz vein of the peacock petrochemical Pb a Pb method measured metallogenic age of 187 ma, belong to the early yanshan, visible its metallogenic epoch is the early stage of yanshan movement in the late indosinian orogeny and area. The above information shows that big gold mine of oreforming elements, sulfur and gangue ponents mainly es from stratum, the oreforming solution for atmospheric precipitation formation of deep groundwater. Turbidite fracture system construction, regional geothermal anomaly and matching is the most important metallogenic conditions. Two metallogenic conditions turbidite built for large formation of gold deposit provides a source of oreforming materials. Big gold deposit mainly occurs in the Triassic BaYanKaLa mountains SLATE clip in sandstone formation, mainly posed of fine clastic sedimentary formation, thickness is a huge black rhythmic rock series, with typical BaoMa sequence characteristics, characterized by: the rhythm of plete layer from the bottom of the coarse sand (gravel) mass unit leaf silty unit leaf argillaceous unit, generally contain a small amount of carbon and pyr