矿产与地质
礦產與地質
광산여지질
MINERAL RESOURCES AND GEOLOGY
2013年
1期
65-69
,共5页
秦志鹏%汪雄武%唐菊兴%唐小倩
秦誌鵬%汪雄武%唐菊興%唐小倩
진지붕%왕웅무%당국흥%당소천
铜多金属矿床%围岩蚀变%蚀变分带%质量平衡
銅多金屬礦床%圍巖蝕變%蝕變分帶%質量平衡
동다금속광상%위암식변%식변분대%질량평형
Cu polymetallic deposit%wall rock alteration%alteration zoning%mass balance%Jiama%Tibet
甲玛铜多金属矿床围岩蚀变发育,可分为四期八个阶段,其中矽卡岩化、绢英岩化与成矿时空关系密切。通过对绢英岩化蚀变岩的质量平衡计算发现,导致绢英岩化围岩蚀变的热液为晚期岩浆分异的富挥发份的含矿硅质富钾酸性流体;并随着蚀变的发生发展,蚀变岩的主元素及成矿元素显示不同的迁移规律但表现出相似的蚀变流体运移趋势,即:以则古郎地区为中心,分别向铜山、铅山及莫古郎地区运移,由于铜山滑覆体阻挡,使得铜山地区蚀变较强,莫古郎地区较弱。
甲瑪銅多金屬礦床圍巖蝕變髮育,可分為四期八箇階段,其中矽卡巖化、絹英巖化與成礦時空關繫密切。通過對絹英巖化蝕變巖的質量平衡計算髮現,導緻絹英巖化圍巖蝕變的熱液為晚期巖漿分異的富揮髮份的含礦硅質富鉀痠性流體;併隨著蝕變的髮生髮展,蝕變巖的主元素及成礦元素顯示不同的遷移規律但錶現齣相似的蝕變流體運移趨勢,即:以則古郎地區為中心,分彆嚮銅山、鉛山及莫古郎地區運移,由于銅山滑覆體阻擋,使得銅山地區蝕變較彊,莫古郎地區較弱。
갑마동다금속광상위암식변발육,가분위사기팔개계단,기중석잡암화、견영암화여성광시공관계밀절。통과대견영암화식변암적질량평형계산발현,도치견영암화위암식변적열액위만기암장분이적부휘발빈적함광규질부갑산성류체;병수착식변적발생발전,식변암적주원소급성광원소현시불동적천이규률단표현출상사적식변류체운이추세,즉:이칙고랑지구위중심,분별향동산、연산급막고랑지구운이,유우동산활복체조당,사득동산지구식변교강,막고랑지구교약。
The development process of wall rock alteration in Jiama Cu polymetallic deposit can be divided into four phases or eight stages. During the process, the space and the time of mineralization is closely related to skarnization and sericitization. The calculation of mass balance of sericitized altered rock shows that the hydrothermal fluid which caused the alteration of sericitized wall rock is a kind of volatile-rich mineral-laden siliceous K-rich acidic fluid differ-entiated by late magma. During the process of alteration, the main elements and metallogenic elements of altered rock have different migration laws and similar migrating trend of altered fluids. The trend is that centering around Zegulang regions and migrating towards Tongshan, Qianshan and Mogulang regions. As the result of blocking of Tongshan slumped overthrust, the alteration in Tongshan region is more intense than that in Mogulang region.