In 1944-1945, the Inner Mongolia Earth Axis(IMEA) was proposed by Prof. HUANG Ji-qing as a consistently uprising unit of Archean basement and a tectonic unit in 'On Major Tectonic Forms of China'. It is distri...In 1944-1945, the Inner Mongolia Earth Axis(IMEA) was proposed by Prof. HUANG Ji-qing as a consistently uprising unit of Archean basement and a tectonic unit in 'On Major Tectonic Forms of China'. It is distributed on the north margin of North China Platform. However, in 1987-1989, the authors made an expedition along the so-called 'IMEA' when they studied the geotectonic evolution of the north margin.展开更多
There are abundant and highly varied trace fossils in the Sinian-Cambrian boundary beds in eastern Yunnan. Collections from 27 sections and their study give altogether 45 ichnogenera and 87 ichnospecies. Among them, 2...There are abundant and highly varied trace fossils in the Sinian-Cambrian boundary beds in eastern Yunnan. Collections from 27 sections and their study give altogether 45 ichnogenera and 87 ichnospecies. Among them, 2 ichnogenera and 7 ichnospecies are new, and 31 known ichnogenera and 38 known ichnospecies first found in the region. According to their order of appearance in the boundary beds and their assemblage features, the trace fossils in the Sinian-Cambrian boundary beds in the region may fall into 4 trace fossil assemblage zones in ascending order. In the paper they are correlated with those in the equivalent horizons abroad and their geological significance is discussed preliminarily.展开更多
An ostracod biostratigraphic study was performed on 425 samples from the composite geological section constructed by using cores taken from five selected wells drilled in the Late Cretaceous Qingshankou Formation in t...An ostracod biostratigraphic study was performed on 425 samples from the composite geological section constructed by using cores taken from five selected wells drilled in the Late Cretaceous Qingshankou Formation in the Songliao basin. A total of 19 ostracod zones are established in the formation, of which 3 are newly established and 3 are revised. The 19 ostracod zones are described in detail. This study provides a basis for the detailed stratigraphic division and correlation of the Qingshankou Formation and the Gaotaizi oil reservoir in the oilfield in the Songliao basin.展开更多
文摘In 1944-1945, the Inner Mongolia Earth Axis(IMEA) was proposed by Prof. HUANG Ji-qing as a consistently uprising unit of Archean basement and a tectonic unit in 'On Major Tectonic Forms of China'. It is distributed on the north margin of North China Platform. However, in 1987-1989, the authors made an expedition along the so-called 'IMEA' when they studied the geotectonic evolution of the north margin.
基金This research was a project (No. 4870087) supported by the National Natural Science Foundation of China.
文摘There are abundant and highly varied trace fossils in the Sinian-Cambrian boundary beds in eastern Yunnan. Collections from 27 sections and their study give altogether 45 ichnogenera and 87 ichnospecies. Among them, 2 ichnogenera and 7 ichnospecies are new, and 31 known ichnogenera and 38 known ichnospecies first found in the region. According to their order of appearance in the boundary beds and their assemblage features, the trace fossils in the Sinian-Cambrian boundary beds in the region may fall into 4 trace fossil assemblage zones in ascending order. In the paper they are correlated with those in the equivalent horizons abroad and their geological significance is discussed preliminarily.
文摘An ostracod biostratigraphic study was performed on 425 samples from the composite geological section constructed by using cores taken from five selected wells drilled in the Late Cretaceous Qingshankou Formation in the Songliao basin. A total of 19 ostracod zones are established in the formation, of which 3 are newly established and 3 are revised. The 19 ostracod zones are described in detail. This study provides a basis for the detailed stratigraphic division and correlation of the Qingshankou Formation and the Gaotaizi oil reservoir in the oilfield in the Songliao basin.
