地球学报
地毬學報
지구학보
ACTA GEOSCIENTIA SINICA
2013年
1期
58-74
,共17页
李建康%王登红*%粱婷%许以明%张怡军%梁华英%卢焕章%赵斌%李建国%屈文俊%周四春%王汝成%韦龙明%林锦福
李建康%王登紅*%粱婷%許以明%張怡軍%樑華英%盧煥章%趙斌%李建國%屈文俊%週四春%王汝成%韋龍明%林錦福
리건강%왕등홍*%량정%허이명%장이군%량화영%로환장%조빈%리건국%굴문준%주사춘%왕여성%위룡명%림금복
南岭成矿带%成矿规律%深部探测%地球物理%西藏
南嶺成礦帶%成礦規律%深部探測%地毬物理%西藏
남령성광대%성광규률%심부탐측%지구물리%서장
Nanling metallogenic belt%metallogenic regularity%deep exploration%geophysics%Tibet
本文通过对桂西北矿集区、湘南矿集区和赣南粤北矿集区的地质学、地球化学、矿床学等方面的研究,扼要对比了南岭西段、中段和东段的地壳演化历史和区域成矿特点,发现在矿集区尺度上,南岭成矿带西段表现为燕山晚期的爆发式成矿作用;南岭成矿带中段表现为伴随多期岩浆活动而发生多期次成矿,形成多金属矿床;东段虽然也发生多期次的岩浆活动,但成矿作用以燕山期早期第一阶段为高峰;南岭西段也具有发现东段式钨矿的潜力.在不同矿集区深部找矿方向上,南岭西段的少花岗岩地区应重点探测与深部隐伏花岗岩体有关的成矿作用,高温高压成矿实验也表明溶洞式矿体也应列为找矿重点;南岭中段应根据不同的成矿环境探测深部矿体,如黄沙坪矿床深部存在“柿竹园式”矿床;南岭东段,应该在“五层楼”下部寻找“地下室”矿体.在物质来源方面,在湘南骑田岭矿集区的探测技术试验结果表明,骑田岭岩体深部存在地幔物质上涌的通道,岩体中心相的细粒黑云母花岗岩较外围的粗粒黑云母花岗岩混入了较多的幔源物质,白蜡水矿区的富锡流纹质次火山岩脉,也暗示深部存在一期更晚的、含幔源物质更多的岩浆活动,与锡矿成矿物质多来源于地幔的认识一致.根据以上认识,并综合对比南岭与西藏成矿的异同,本文认为在西藏地区,宜在低剥蚀地区的中低温热液矿床的深部探测钨锡矿床,在发育老地层的高剥蚀地区寻找中高温热液型钨锡矿床.
本文通過對桂西北礦集區、湘南礦集區和贛南粵北礦集區的地質學、地毬化學、礦床學等方麵的研究,扼要對比瞭南嶺西段、中段和東段的地殼縯化歷史和區域成礦特點,髮現在礦集區呎度上,南嶺成礦帶西段錶現為燕山晚期的爆髮式成礦作用;南嶺成礦帶中段錶現為伴隨多期巖漿活動而髮生多期次成礦,形成多金屬礦床;東段雖然也髮生多期次的巖漿活動,但成礦作用以燕山期早期第一階段為高峰;南嶺西段也具有髮現東段式鎢礦的潛力.在不同礦集區深部找礦方嚮上,南嶺西段的少花崗巖地區應重點探測與深部隱伏花崗巖體有關的成礦作用,高溫高壓成礦實驗也錶明溶洞式礦體也應列為找礦重點;南嶺中段應根據不同的成礦環境探測深部礦體,如黃沙坪礦床深部存在“柿竹園式”礦床;南嶺東段,應該在“五層樓”下部尋找“地下室”礦體.在物質來源方麵,在湘南騎田嶺礦集區的探測技術試驗結果錶明,騎田嶺巖體深部存在地幔物質上湧的通道,巖體中心相的細粒黑雲母花崗巖較外圍的粗粒黑雲母花崗巖混入瞭較多的幔源物質,白蠟水礦區的富錫流紋質次火山巖脈,也暗示深部存在一期更晚的、含幔源物質更多的巖漿活動,與錫礦成礦物質多來源于地幔的認識一緻.根據以上認識,併綜閤對比南嶺與西藏成礦的異同,本文認為在西藏地區,宜在低剝蝕地區的中低溫熱液礦床的深部探測鎢錫礦床,在髮育老地層的高剝蝕地區尋找中高溫熱液型鎢錫礦床.
본문통과대계서북광집구、상남광집구화공남월북광집구적지질학、지구화학、광상학등방면적연구,액요대비료남령서단、중단화동단적지각연화역사화구역성광특점,발현재광집구척도상,남령성광대서단표현위연산만기적폭발식성광작용;남령성광대중단표현위반수다기암장활동이발생다기차성광,형성다금속광상;동단수연야발생다기차적암장활동,단성광작용이연산기조기제일계단위고봉;남령서단야구유발현동단식오광적잠력.재불동광집구심부조광방향상,남령서단적소화강암지구응중점탐측여심부은복화강암체유관적성광작용,고온고압성광실험야표명용동식광체야응렬위조광중점;남령중단응근거불동적성광배경탐측심부광체,여황사평광상심부존재“시죽완식”광상;남령동단,응해재“오층루”하부심조“지하실”광체.재물질래원방면,재상남기전령광집구적탐측기술시험결과표명,기전령암체심부존재지만물질상용적통도,암체중심상적세립흑운모화강암교외위적조립흑운모화강암혼입료교다적만원물질,백사수광구적부석류문질차화산암맥,야암시심부존재일기경만적、함만원물질경다적암장활동,여석광성광물질다래원우지만적인식일치.근거이상인식,병종합대비남령여서장성광적이동,본문인위재서장지구,의재저박식지구적중저온열액광상적심부탐측오석광상,재발육로지층적고박식지구심조중고온열액형오석광상.
In this paper, through a comparative study of the geological and geochemical features of the typical ore concentration areas, the authors summarized the evolution of the crust and regional metallogenic regularities in the western, middle and eastern regions of the Nanling metallogenic belt. In the western region, magmas intruded into the late Paleozoic and early Mesozoic crust in a short time with an explosive type Sn mineralization in late Yanshanian epoch; in the middle region, magmas intruded into the late Paleozoic crust for a long time accompanied by polymetallic and multi-stage mineralization; in the eastern region, magmas intruded into early Paleozoic crust with the W mineralization peak in Yanshanian epoch, indicating that W mineralization might have occurred in the early Paleozoic crust of the western Nanling region. Correspondingly, the concealed granite, the Shizhuyuan-type deposit under Huangshaping type deposit, and the “basement” under the “five-storey” type W deposit should be the deep exploration targets in the western, middle and eastern Nanling regions, respectively. In addition, the deep exploration across the Qitianling intrusion in southern Hunan Province shows the existence of an upwelling pathway for mantle material indicated by artificial earthquake test at the center of the intrusion, where the later fine-grained granite contained more mantle material than the early coarse-grained granite in the light of Os isotope. In addition, the Sn-rich rhyolite subvolcanic rock vein that intruded into the early coarse grained granite in the Bailashui Sn deposit is a indicator of a later magmatism characterized by enrichment of mantle materiald in the depth of Qitianling intrusion. These metallogenic regularities in Nanling have indicating significance for W-Sn exploration in Tibet, i.e., to explore W-Sn mineralization in the depth of epi-mesothermal deposits in low erosion areas, and to explore the meso-hypothermal W-Sn deposits in the high erosion areas.
