广东高要—广宁地区兰源—江屯动力变质带的地质特征...
文章关键词:
动力 变质带 金矿 分布 地质特征
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ntionedaboveareoftenthe1ocatlonswherenlobium—tantalumandgoldmineralizationsareconcentrated.ThesepositionsareevidentlYequal1Yspacedatintervalofabout25—3Okm.Moreover,theniobium—tantalumandgolddepositsformtwoNE—trendingbeltssidebyside,withtheniobium—tantalumbeltonthenorthwestandthegoldbeltOnthesoutheast.TheintimateRSSOCiationofthesetwobeltsi11SpaceseamstodemonstratethattheY一57—geliesisandevolutionofmigmatlteandAl1ofthegoIddepositsoccurmerelywithinthesecondaryofIate·stagefauItsofthedynamometalTtOrphicbe1tanda1Itheoreveius(orebodies)strikeNEorENE,ilidudlngsuchgolddepositsoroccurrencesasXinzhou,Nalichong.Tagang,ZeligchuliandShoangbao.Basedo/1alter—ation,minera1parageliesiSandtracee1ementcharacteristics,itisbelievedthatgo1ddepositsofthisareadisp1ayallobviouspostmagmatichydrothermalaiteratiolifeature,andhelleeshouldbeattributedtotheUalteredcrushedrocktype"golddepositalthoughdifferentsubtypesagealsoliotedfrom12ortheastto$00theast.Forexample,theXiuzhoude—positisofaaqoartzveinsub—type”whiletheTagang~ZengchunandShuangbaodepositsareofthe"alteredcrushedrocktype”proper~ofwhichtheShuangbaodepositisagolddepositwithatypicalineso-epitherma1aIterlitjoilfeature.广西北海涠洲岛第四纪学术交流讨论会”召开中国古生物学会湘,粤、桂联合组和广西地质学会,于1900年8月5日到8月9日在广西北海市疆iIf【镇联合举办了“广西北海涠洲岛第四纪学术交流讨论会,到会有湖南、广东、广西三省联合组成员及湖北、江苏等地代表共26人。会议就三省的有关生物地层学、现代海洋沉积学、现代生态学和海蚀地貌等方面进行了广泛的交流,并对涠洲岛的海蚀地貌.现代海洋沉积、现代生态、环境保护等问题进行了现场考察,参观叮第四纪北海船堆积的标准剖面北海组。到会代表各抒己见,对北海组的沉积相.地质年代等提出许多不同的看法,并对涠·洲岛旅游业的开发等提出了不少建设性意见。(秦国荣报逋).ehO,Ⅱ.a协ganS恤恤e帆SetenVaarhg
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刘光龙 梁汉群
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