西藏班公湖-怒江结合带木嘎岗日岩群时代上限的新证据——来自恐弄拉地区早白垩世早期孢粉化石的报道
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摘要
在班公湖-怒江结合带中段的恐弄拉地区木嘎岗日岩群其西弄岩组中发现早白垩世早期Dicheiropollis sp(.双手粉)和Cicatricosisporites sp(.无突肋纹孢)孢粉组合。明确了木嘎岗日岩群的沉积上限至少持续到早白垩世早期,为从生物年代学角度厘定木嘎岗日岩群提供了可靠的资料,也为今后进-步分析班公湖-怒江结合带中生代盆地演化提供了线索。
Early Early Cretaceous palynoflora such as Dicheiropollis and Cicatricosisporites were found in Qixinong Formation of Mugakangri group-complex along the central segment of the Bangong-Nujiang junction zone, Tibet, and this discovery proves that the upper sedimentary limit of Mugakangri group-complex at least lasted until early Early Cretaceous, provides true and reliable paleontological data for determining Mugakangri group-complex in the light of biological chronology, and supplies clues for further analysis of Mesozoic basin evolution of the Bangong-Nujiang junction zone.
Early Early Cretaceous palynoflora such as Dicheiropollis and Cicatricosisporites were found in Qixinong Formation of Mugakangri group-complex along the central segment of the Bangong-Nujiang junction zone, Tibet, and this discovery proves that the upper sedimentary limit of Mugakangri group-complex at least lasted until early Early Cretaceous, provides true and reliable paleontological data for determining Mugakangri group-complex in the light of biological chronology, and supplies clues for further analysis of Mesozoic basin evolution of the Bangong-Nujiang junction zone.
引文
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(1)江西省地质调查院.西藏喀纳幅、日土县幅1∶25万区域地质调查报告.江西地质调查院,2005.
(2)西藏自治区地质调查院.西藏班戈县幅1∶25万区域地质调查报告.西藏自治区地质调查院,2005.
[2]西藏自治区地质矿产局.西藏自治区岩石地层[M].北京:地质出版社,1997.
[3]曹圣华,肖晓林,欧阳克贵.班公湖-怒江结合带西段侏罗纪木嘎岗日群的重新厘定及意义[J].沉积学报,2008,4.
[4]陈国荣,陈玉禄,张宽忠,等.班戈县幅地质调查新成果及主要进展[J].地质通报,2004,23(5/6):520-524.
[5]潘桂棠,王立全,等.青藏高原及邻区地质图及说明书(1∶1500000)[M].北京:地质出版社,2013.
[6]王立全,潘桂棠,等.青藏高原及邻区大地构造图及说明书(1∶1500000)[M].北京:地质出版社,2013.
[7]Vakkrcmecv V A.Range and paleoenology of Mesozoicconifers[J].The Cheirolepidiaceae.Paleanl.Zh.,1970,70(1):19-34.
[8]黎文本.塔里木盆地北部早白垩世孢粉组合[J].古生物学报,2000,39(1):28-45.
[9]黎文本,陈金华.白垩系[C]//周志毅,陈丕基.塔里木生物地层和地质演化.北京:科学出版社,1990:288-307.
[10]张望平.Dicheiropollis在云南富民盆地安宁组孢粉组合中的出现及其意义[J].微体古生物学报,1995,12(2):39-49.
[11]Li J G,Batten D J.Early Cretaceous palynofloras from the Tanggula Mountains of the northern Qianghai-Xizang(Tibet)Plateau,China[J].Cretaceous Research,2004,25:531-542.
(1)江西省地质调查院.西藏喀纳幅、日土县幅1∶25万区域地质调查报告.江西地质调查院,2005.
(2)西藏自治区地质调查院.西藏班戈县幅1∶25万区域地质调查报告.西藏自治区地质调查院,2005.