甘肃北山北部红石山地区泥盆纪雀儿山群及古孢子化石组合基本特征
Features of the Strata for Devonian Queershan Group in Hongshishan Area of Beishan’s Northern Belt, Gansu
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摘要: 在1:25万红宝石幅(K47C002001)图幅中,雀儿山群分布于哈萨克斯坦板块南缘,红石山蛇绿混杂岩带以北地带的双沟山—雀儿山一带,为一套宏观色调为灰绿色中基性、中酸性火山岩及其火山碎屑岩夹碎屑岩和灰岩的岩石组合.碎屑岩及灰岩中含腕足、珊瑚、三叶虫、海百合茎等生物化石.其中:Latonotoechia cf.latana(Barrande)原产于波希来亚地区布拉格期.Acrospirifer cobed anus varius Kaplun见于哈萨克斯坦地区下泥盆统中上部和新疆的和布克赛尔组.Eoschuchertella guangxiensis Wanget Rong原于广西郁江组上部六景段.该群形成于与岛弧有关的滨浅海环境,在区域上可与新疆大南湖组、头苏泉组及和布克赛尔组对比.该群形成时代为早—中泥盆世,年代地层为下—中泥盆统.Abstract: Through 1:250000 geological mapping in Hongbaoshi area,Queershan Group is distributed in Shuanggoushan-Queershan area to the northern ophiolitic melange accumulation in Hongshishan in the southern margin of Kazakstan Plate.It consists of a set of celadon intermediate-basic,intermediate-acidic volcanic rocks and volcanic-clastic rocks intercalated clastic rocks.There are Brachiopoda,Anchozoa,Trilobita,Crinoidea et al.fossils in the clastic rocks and limestone.Latontechia cf.latana(Barrande) early formed in Barrandeehoch in Bo xilaiya region.A crospivifer cobedanus varius Kaplun have been discovered in Lower Devonian in Kazakstan region and Hebukeser Formatino of Xinjiang.Eoschuchertella guangxiensis Wang et Rong early formed in Yujiang Formation of Guang xi.This group formed in the litto ral-shallow marine facies which related to the island arc.It can compare with Dananhu Formation,Tousuquan Formation and Hebukeser Formation of Xinjiang.It formed in Early-Middle Devonian.
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Keywords:
- Beishan /
- Hongshishan /
- Devonian /
- Queershan Group /
- feature of strata
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