Study on Early-Middle Permian Reef and Its Sequence Stratigraphy in Maerzheng Area, Eastern Kunlun
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摘要: 论述了秦祁昆结合带早中三叠世时不同地区的沉积环境、盆地格架、构造古地理等特征.根据岩石组合特征、沉积特征和古生物化石组合, 分析研究了早中三叠世秦祁昆结合带地层的相变、超覆、穿时现象.论述了闹仓坚沟组的岩石组合特征、岩相、时代, 并对其含义进行了修订, 认为闹仓坚沟组的时代是早中三叠世, 由灰岩和碎屑岩组成, 灰岩从底部上穿到顶部与碎屑岩呈相变关系.并阐述了秦祁昆结合带的沉积、构造古地理特征.Abstract: The paper describes the sedimentary environment, basin framework and tectonic paleogeography in different regions in the joint of Qinling, Qilian and eastern Kunlun, Northwest China. It analyzes the facies change, overlapping and time transverse of the strata from Early to Middle Triassic on the basis of rock assemblage and sediment characteristics and fossil assemblages. Then it discusses the rock assemblage and sediment characteristics and age of Naocangjiangou Formation and ended with the revision of its meaning. It is considered that Naocangjiangou Formation could have been formed in from Early to Middle Triassic, consisting of limestone and clastic rocks. The limestone occurs from its bottom to its top with changing facies in between. Furthermore, it expatiates the sedimentary and paleogeographical characters of western Qinling, Qilian and eastern Kunlun.
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Key words:
- Early-Middle Triassic /
- tectonic paleogeography /
- western Qinling /
- southern Qilian /
- eastern Kunlun
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图 1 秦祁昆早中三叠世构造古地理
1.古陆; 2.水下隆起; 3.东昆中滨浅海建造; 4.东昆南半深海复理石建造; 5.巴颜喀拉盆地浊积建造; 6.柴北缘滨浅海建造; 7.布青山阿尼玛卿残留海碎屑岩建造; 8.西秦岭盆地浊积建造; 9.共和盆地浊积建造; 10.南祁连滨浅海碎屑岩建造; 11.南祁连浅海碳酸盐岩建造; 12.中酸性火山岩建造; 13.河湖相沉积; 14.构造古地理单元分界线
Fig. 1. Tectonic paleogeography of Early-Middle Triassic in western Qinling, Qilian and eastern Kunlun
图 2 青海省玛多县黑海乡中三叠世闹仓坚沟组岩相柱状图
1.砾岩; 2.含砾砂岩; 3.含砾长石石英砂岩; 4.砂岩; 5.钙质砂岩; 6.晶屑凝灰岩; 7.安山岩; 8.板岩; 9.鲍马层序; 10.平行层理; 11.水平层理; 12.正反粒序; 13.遗迹化石
Fig. 2. Facies column of Naocangjiangou Formation of Middle Triassic in Heihai, Maduo County, Qinghai Province
图 3 青海省都兰县香加乡宝日禾日俄早三叠世洪水川组岩相柱状图
1.砾岩; 2.含砾长石石英砂岩; 3.含砾长石砂岩; 4.长石岩屑砂岩; 5.长石石英砂岩; 6.钙质砂岩; 7.灰岩; 8.砂屑灰岩; 9.核形石灰岩; 10.泥晶灰岩; 11.结晶灰岩; 12.泥质条带灰岩; 13.角砾状灰岩; 14.泥质灰岩; 15.生物碎屑灰岩; 16.砾石定向; 17.平行层理; 18.楔状交错层理; 19.水平层理
Fig. 3. Facies column of Hongshuichuan Formation and Naocangjiangou Formation in Baoriherie, Dulan County, Qinghai Province
图 4 青海省都兰县宗加乡浩特洛哇早—中三叠世洪水川组-闹仓坚沟组岩相柱状图
1.砾岩; 2.复成分砾岩; 3.含粒钙质石英砂岩; 4.含砾长石石英砂岩; 5.钙质石英砂岩; 6.粉砂岩; 7.泥质粉砂岩; 8.泥晶灰岩; 9.竹叶状灰岩; 10.角砾状灰岩; 11.核形石灰岩; 12.晶屑凝灰岩; 13.晶屑岩屑凝灰岩; 14.粉砂质板岩; 15.交错层理; 16.槽状交错层理; 17.平行层理; 18.水平层理; 19.动物化石
Fig. 4. Facies column of Hongshuichuan Formation and Naocangjiangou Formation of Early-Middle Triassic in Haoteluowa, Dulan County, Qinghai Province
图 5 青海省都兰县沟里乡加嗡门沟口早三叠世洪水川组岩相柱状图
1.砾岩; 2.含砾砂岩; 3.砂岩; 4.石英砂岩; 5.长石砂岩; 6.岩屑砂岩; 7.泥质砂岩; 8.凝灰质火山角砾岩; 9.砾石定向; 10.楔状交错层; 11.平行层理; 12.波状层理
Fig. 5. Facies column of Hongshuichuan Formation of Early Triassic in Jiawengmengou, Dulan County, Qinghai Province
图 6 甘肃省永登县坪城堡早中三叠世西大沟组岩相柱状图
Fig. 6. Facies column of Xidagou Formation of Early-Middle Triassic in Pingchengpu, Yongdeng County, Gansu Province
表 1 秦祁昆结合带早中三叠世地层格架
Table 1. Stratigraphic frame of Early-Middle Triassic in western Qinling, Qilian and eastern Kunlun
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