Storm Deposits and Biogenic Structures from the Carbonate of the Mantou Formation (Cambrian), Dengfeng Area, Western Henan
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摘要: 豫西登封地区寒武系第三统馒头组三段发育了一套含大量生物成因构造的碳酸盐岩风暴沉积。风暴沉积标志包括冲刷面构造、砾屑灰岩及各类交错层理,生物成因构造包括微生物成因构造-叠层石及后生动物扰动构造-各类垂直潜穴。该区风暴沉积包括3种沉积序列:序列1由侵蚀底面、砾屑灰岩段和交错层理段组成,代表了风暴高峰期和衰减期形成的原地型风暴沉积;序列2由侵蚀底面、砾屑灰岩段和泥岩、泥灰岩段组成,为风暴高峰期和间歇期形成的近源型风暴沉积;序列3由侵蚀底面、交错层理段和叠层石灰岩段组成,反映了风暴衰减期和间歇期形成的远源型风暴沉积。这些风暴沉积代表了不同风暴作用留下的多期不完整风暴沉积记录。Abstract: A suit of carbonate storm deposits with a large amounts of biogenic structures are well preserved in the Mantou Formation (Cambrian ), Dengfeng, western Henan Province. The storm sedimentary textures include physical textures of scoured bases, flat-pebble limestone beds and various cross-beddings. The biogenic textures include microbiogenic structures (stromatolites) and metazoan disturbed structures (vertical burrows). Three storm sedimentary successions are recognized in study area. The succession 1 consists of scoured bases, flat-peb-ble limestone beds and various cross-beddings, reflecting the in situ storm deposits formed in strong stage and weakening stage. The succession 2 is dominated by scoured bases, flat-pebble limestone beds and mud-stone-marl, representing the proximal storm deposits formed in strong stage and quiet stage. The succession 3 is characterized by scoured bases, various cross-beddings and stromatolite limestone beds, displaying the distal storm deposits formed in weakening stage and quiet stage. The above storm deposits are the multi-phase incom-plete storm records at different storm processes.
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Key words:
- storm deposit /
- Cambrian /
- Mantou Formation /
- biogenic structures /
- carbonate
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