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安徽淮南地区新元古代刘老碑组主要由页岩和中薄层泥质、粉砂质灰岩组成。在该组上部中薄层砂质灰岩中产有该地区新元古代最古老的叠层石Baicalia和?Linella。大量的臼齿碳酸盐脉体穿插在该组叠层石的基本层中的现象较为独特,该组上部发育的滑塌构造和臼齿碳酸盐岩脉体的特征表明该沉积时期发生过强烈的地震活动;此外,在叠层石礁体周围还有大量的风暴沉积产出。这些现象表明,该组叠层石发育于风暴活动和地震活动交织的环境之中,地震活动是导致该组叠层石消失的主要原因。 相似文献
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Earthquake events in Neoproterozoic and Early Paleozoic and its relationship with supercontinental Rodinia in North China 总被引:7,自引:0,他引:7
Carbonate liquefied veins in limestone and liquefied mud veins in mudstone are the result by earthquake, which is liquefied
in sediments and a strong earthquake event remains clearly records in strata. 24 strata units with earthquake events (molar
tooth), which are subdivided into 11 seismic periods, have been distinguished from Mid-Proterozoic to Early Paleozoic strata
in the Sino-Korean platform. The distributions of them represent paleo-seismic tectonic zones in different periods, which
is tallied with convergent continental block before Proterozoic supercontinental Rodinia and the evidence of the breakup or
splitting developed in the inner Sino-Korean Platform in 700 Ma. 相似文献
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J. N. Thompson Jr W. E. Spivey D. K. Duncan 《Cellular and molecular life sciences : CMLS》1985,41(10):1346-1347
Summary The mutant hairy (h) increases the number of sensillae on theDrosophila wing. This allows us to quantify a gradient that determines the type of sense organ that forms along the third long vein. Temperature significantly shifts the positional responses to this underlying gradient.This research was supported by National Science Foundation grant BSR-8300025. We thank Laura Karcher for the figure. 相似文献