Mississippian (Early Carboniferous) stromatolite mounds in a fore-reef slope setting, Laibin, Guangxi, South China
Mississippian (Early Carboniferous) stromatolite mounds in a fore-reef slope setting, Laibin, Guangxi, South China
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华南广西来宾市前礁斜坡环境中的密西西比期（早石炭世）叠层石丘
DOI：
10.1007/s00531-008-0392-2
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发表时间：
2010-03
期刊：
影响因子：
--
通讯作者：
沈建伟
中科院分区：
文献类型：
--
作者：
沈建伟
早石炭世密西西比期是华南地区碳酸盐岩普遍缺乏的时期。本文对广西来宾市孟村和河绿村叠层石土丘的露头进行了研究。叠层石土丘包含各种叠层石形态，包括层状、波状层状、圆顶状或半球状、球根状和扇形生长柱。内部岩石为腕足类浮岩和暗色薄层层状泥晶灰岩。孟村的单个叠层石一般厚3-6 cm，形态上表现为浅水层片状（平面状和波状叠层石）和深水穹状、球根状和柱状。在土丘形成的地方，叠层石继续向上生长，厚达60厘米。血栓炎性组织也会出现，但并不常见。叠层石的显微结构显示，大部分的层压由波状的微生物岩和离散的薄泥晶纹层组成。这些土丘夹在深水前礁堆积角砾岩、生物碎屑流形成的碎屑岩和含有Tatang组（Viséan晚期）普通燧石层的薄层石灰岩中。支持叠层岩土丘深水环境的进一步证据是：（1）腕足动物浮岩横向变薄的层位，包含深水、小型、薄壳腕足动物、泥晶沉积物和低多样性的混合动物群（例如，薄壳腕足动物、管状蠕虫和藻类），被解释为风暴沉积;（2）常见的礁前岩屑角砾岩;（3）缺乏表明当前活动的沉积结构;（4）保存有海绵骨针的层压;（5）缺乏生物扰动作用，表明叠层石生长在相对低能量的深水环境中。叠层石土丘是中国南方密西西比纪地层中首次发现的叠层石土丘，它包含的证据支持了对（1）密西西比纪微生物堆积的生长历史和（2）叠层石生长和石化的环境控制的解释。
The Mississippian (Early Carboniferous) is generally a period of scarce carbonate buildups in South China. This study documents outcrops of stromatolite mounds at Mengcun and Helv villages, in Laibin City, Guangxi Province, South China. The stromatolite mounds contain various stromatolite morphologies including laminar, wavy-laminar, domal or hemispheroidal, bulbous, and flabellate-growth columns. Intramound rocks are brachiopod floatstone and dark thin-bedded laminated micrite limestone. Individual stromatolites at Mengcun village are generally 3–6 cm thick and morphologically represent relatively shallow-water laminar (planar and wavy-undulated stromatolites) and deeper-water domal, bulbous and columnar forms. Where mounds were formed, the stromatolites continued growing upward up to 60 cm thick. Thrombolitic fabrics also occur but are not common. Stromatolite microscopic structure shows the bulk of the lamination to consist of wavy microbialite and discrete thin micritic laminae. These mounds are intercalated in deep-water fore-reef talus breccia, packstone formed as a bioclastic debris flow and thin-bedded limestone containing common chert layers of the Tatang Formation (late Viséan). Further evidence supporting the deep-water setting of the stromatolite mounds are: (1) a laterally thinning horizon of brachiopod floatstone containing deep-water, small, thin-shelled brachiopods, peloidal micritic sediments and low-diversity, mixed fauna (e.g., thin-shelled brachiopods, tube-like worms and algae) that have been interpreted as storm deposits, (2) common fore-reef talus breccias, (3) lack of sedimentary structures indicating current action, (4) preservation of lamination with sponge spicules, and (5) lack of bioturbation suggesting that the stromatolites grew in a relatively low energy, deep-water setting. The stromatolite mounds are the first described stromatolite mounds in Mississippian strata of South China and contain evidence that supports interpretations of (1) growth history of Mississippian microbial buildups and (2) environmental controls on stromatolite growth and lithification.
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影响因子：
1.8
作者：
H. Sano;K. Kanmera
通讯作者：
H. Sano;K. Kanmera
影响因子：
1.6
作者：
R. R. West-R.
通讯作者：
R. R. West-R.
影响因子：
5.8
作者：
Daniel C. Pope;S. Willett
通讯作者：
Daniel C. Pope;S. Willett
影响因子：
5.8
作者：
A. Draut;P. Clift
通讯作者：
A. Draut;P. Clift
DOI：
10.2110/pec.02.72.0239
发表时间：
2002
期刊：
--
影响因子：
--
作者：
G. Webb
通讯作者：
G. Webb