华南地质与矿产
華南地質與礦產
화남지질여광산
GEOLOGY AND MINERAL RESOURCES OF SOUTH CHINA
2012年
4期
290-297
,共8页
龙文国%徐德明%王磊%周岱%金鑫镖%张鲲
龍文國%徐德明%王磊%週岱%金鑫鏢%張鯤
룡문국%서덕명%왕뢰%주대%금흠표%장곤
前寒武纪基底%副片麻岩%新元古代%锆石u—Pb年龄%云开地区
前寒武紀基底%副片痳巖%新元古代%鋯石u—Pb年齡%雲開地區
전한무기기저%부편마암%신원고대%고석u—Pb년령%운개지구
Precambrian basement%paragneiss%Neoproterozoie%Zircon U-Pb dating,Yunkai area,South China
两广云开地区出露的前寒武纪基底岩石主要是以天堂山岩群为代表的深变质岩系和以云开群为代表的浅变质岩系。对天堂山岩群的副片麻岩中的锆石u—Pb年代学研究显示,其主要由新元古代(651~760Ma)、Grenvill期(939~1206Ma)的碎屑物质组成,其中还包括一定数量早中元古代一早元古代(1439—2369Ma)、新太古代(2540Ma)碎屑物质,天堂山岩群中部分深变质岩的原岩是新元古代形成的沉积岩,与粤北、粤东北及闽西地区基底变质岩原岩的形成时代是基本一致的。云开群的形成时代晚于天堂山岩群的形成时代。
兩廣雲開地區齣露的前寒武紀基底巖石主要是以天堂山巖群為代錶的深變質巖繫和以雲開群為代錶的淺變質巖繫。對天堂山巖群的副片痳巖中的鋯石u—Pb年代學研究顯示,其主要由新元古代(651~760Ma)、Grenvill期(939~1206Ma)的碎屑物質組成,其中還包括一定數量早中元古代一早元古代(1439—2369Ma)、新太古代(2540Ma)碎屑物質,天堂山巖群中部分深變質巖的原巖是新元古代形成的沉積巖,與粵北、粵東北及閩西地區基底變質巖原巖的形成時代是基本一緻的。雲開群的形成時代晚于天堂山巖群的形成時代。
량엄운개지구출로적전한무기기저암석주요시이천당산암군위대표적심변질암계화이운개군위대표적천변질암계。대천당산암군적부편마암중적고석u—Pb년대학연구현시,기주요유신원고대(651~760Ma)、Grenvill기(939~1206Ma)적쇄설물질조성,기중환포괄일정수량조중원고대일조원고대(1439—2369Ma)、신태고대(2540Ma)쇄설물질,천당산암군중부분심변질암적원암시신원고대형성적침적암,여월북、월동북급민서지구기저변질암원암적형성시대시기본일치적。운개군적형성시대만우천당산암군적형성시대。
Precambrian basement rocks outcropping Yunkai area are composed of high metamorphic rocks represented by Tantangshan Group and lower metamorphic rocks represented by Yukai Group. U-Pb dating for detrital zircon from a paragneiss of Tantangshan Group, indicates that the Neoproterozoic sediments in Yunkai area hinterland are mainly composed of Neoproterozoic (651 - 760 Ma) and Grenvill period (939 - 1206 Ma) clastic materials, which also including a certain number of early Mesoproterozoic - early Proterozoic (1439 - 2369 Ma), the Neoarchean (2540 Ma) clastic materials, The formation age of basement rocks in Yunkai area is basically same with those in the northern part of Guangdong, northeastern Guangdong and western Fujian. The formation age of Yunkai Group is younger than the formation age of Tiantangshan Group.