| 王少怀.菲律宾西必塔脉状金矿拉拉布矿床的浅成低温热液成矿作用[J].地质找矿论丛,2007,(2):93-99 |
| 菲律宾西必塔脉状金矿拉拉布矿床的浅成低温热液成矿作用 |
| METALLOGENESIS OF VEIN-TYPE EPITHERMAL LALAB GOLD DEPOSIT AT SIBUTAD,PHILIPPINES |
| 投稿时间：2006-12-13 修订日期：2007-01-29 |
| DOI：10.6053/j.issn.1001-1412.2007.2. 003 |
| 中文关键词: 西必塔金矿 拉拉布矿床 成矿作用 浅成低温热液金矿床 菲律宾 |
| 英文关键词:Sibutad gold ore area Lalab gold deposit metallogenesis epithermal gold deposit Philippines |
| 基金项目:财政部海外风险矿产勘查项目资助 |
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| 中文摘要: |
| 棉兰老岛西部的西必塔(Sibutad)脉状金矿是近年来发现的极具经济潜力的浅成低温热液型金矿,可划分成拉蜡洋和拉拉布(Labab)2个矿床。金矿赋存于中新世-更新世马林丹(Malmdang)群火山岩中,火山岩呈零星岛状散布于斯丹岗(Sindangan)—哥塔巴托(Cotabato)—大姑玛(Daguma)线性构造活动带的东部,并被安山玢岩侵入。该火山岩可分为2段,下段由安山质熔岩、英安岩、凝灰岩组成,西必塔金矿即赋存于该段中。安山岩具有明显的热液蚀变和金成矿作用,属于冰长石-绢云母型金矿化,金是在pH值近中性的浅表环境中由于热液沸腾并伴随流体的混合沉淀而成,通常富集于标高30~200m。金的富集经过4个阶段:①形成角砾岩之前的围岩蚀变阶段;②热液角砾岩形成阶段;③形成角砾岩后的围岩蚀变阶段;④金矿形成阶段。 |
| 英文摘要: |
| The Sibutad vein-type epithermal gold deposit is the most promising economic ones found in recent years in Zamboanga del Norte Province in Zamboanga Peninsula,Mindanao island.Gold deposits at Sibutad occur in Pliocene to Pleistocene volcanic rocks that are distributed as sporadic islands in the east of the tectonically active Sindangan-Cotabato-Daguma linear structure.The host rocks are the Malindang volcanics,composed of lower and upper members,which are both intruded by andesitic porphyrite.The lower member is made up of andesitic lava, dacite and tuffite and gold deposits,such as Larayan and Lalab.Whereas,volcanic breccia and tuff breccia characterize the upper member.In Lalab gold deposit andesite is hydrothermally altered and mineralized.The mineralization belongs to adularia-sericite type.Gold was precipitated from reduced,neutral pH solutions within a shallow to near-surface environment.The following events lead to the Lalab orebody:①pre-breccia wallrock alteration,②hydrothermal brecciation,③post-breccia wallrock alteration,and④formation of gold ore.Gold precipitated with fluid boiling and fluid mixing.And prolific gold zones occur at elevation of 30m and 200m. |
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