The lower crustal xenolith of mafic two_pyroxene granulite (the majority) and hypersthene granulite in the Cenozoic basalt at Hannuoba have the characteristics of igneous blastic structure and granulite facies metamor...The lower crustal xenolith of mafic two_pyroxene granulite (the majority) and hypersthene granulite in the Cenozoic basalt at Hannuoba have the characteristics of igneous blastic structure and granulite facies metamorphic recrystallization. Study on the zircon chronology and REE geochemistry of granulite xenolith shows that the underplating of basic magma into the lower crust during late Mesozoic led to the formation of mafic accumulate, which further through metamorphism of granulite facies formed the high_density and high_velocity crustal bottom layer at the lower crust. This suggests that the underplating of mantle magma is the important way for the vertical overgrowth of continental crust since the Phanerozoic and provides new evidence for crust_mantle interaction.展开更多
Northwest of Cheju Island in the eastern South Yellow Sea there is an arc patch of muddy deposit which coincides with an anticlokwise eddy and thus is referred to as muddy deposit of eddy. Two drilling wells, the YSDP...Northwest of Cheju Island in the eastern South Yellow Sea there is an arc patch of muddy deposit which coincides with an anticlokwise eddy and thus is referred to as muddy deposit of eddy. Two drilling wells, the YSDP 102 well and the YSDP 103 well, penetrated the muddy deposit and revelated the sedimentary sequence in the sea area during the last deglaciation and the Holocene. Based on shallow seismic profiles, sedimentary features and dating data, stratigraphic units formed in the eastern South Yellow Sea, documents the path, time and process of the earliest post-glacial transgression in the South Yellow Sea are presented, the formation of the Yellow Sea warm current and its control over the Yellow Sea sedimentation are discussed, and deals with the source of the muddy deposit is dealt with.展开更多
Systematic, fixed_point and long observations and sample testing make clear distributions of methane and the homologues in the low_layer air over eastern China and sea areas. Within about 250 km from epicenter of mode...Systematic, fixed_point and long observations and sample testing make clear distributions of methane and the homologues in the low_layer air over eastern China and sea areas. Within about 250 km from epicenter of moderate and strong earthquakes, oil_gas areas have methane concentration anomaly and CO\-2 anomaly in the low_layer atmosphere around the earthquakes, have a temperature increase by 1-6℃ at the occurrence of moderate and strong earthquakes and indicate that concentration anomaly of methane family in the low_layer air can be used as an important index for petroleum geochemical exploration.展开更多
文摘The lower crustal xenolith of mafic two_pyroxene granulite (the majority) and hypersthene granulite in the Cenozoic basalt at Hannuoba have the characteristics of igneous blastic structure and granulite facies metamorphic recrystallization. Study on the zircon chronology and REE geochemistry of granulite xenolith shows that the underplating of basic magma into the lower crust during late Mesozoic led to the formation of mafic accumulate, which further through metamorphism of granulite facies formed the high_density and high_velocity crustal bottom layer at the lower crust. This suggests that the underplating of mantle magma is the important way for the vertical overgrowth of continental crust since the Phanerozoic and provides new evidence for crust_mantle interaction.
文摘Northwest of Cheju Island in the eastern South Yellow Sea there is an arc patch of muddy deposit which coincides with an anticlokwise eddy and thus is referred to as muddy deposit of eddy. Two drilling wells, the YSDP 102 well and the YSDP 103 well, penetrated the muddy deposit and revelated the sedimentary sequence in the sea area during the last deglaciation and the Holocene. Based on shallow seismic profiles, sedimentary features and dating data, stratigraphic units formed in the eastern South Yellow Sea, documents the path, time and process of the earliest post-glacial transgression in the South Yellow Sea are presented, the formation of the Yellow Sea warm current and its control over the Yellow Sea sedimentation are discussed, and deals with the source of the muddy deposit is dealt with.
文摘Systematic, fixed_point and long observations and sample testing make clear distributions of methane and the homologues in the low_layer air over eastern China and sea areas. Within about 250 km from epicenter of moderate and strong earthquakes, oil_gas areas have methane concentration anomaly and CO\-2 anomaly in the low_layer atmosphere around the earthquakes, have a temperature increase by 1-6℃ at the occurrence of moderate and strong earthquakes and indicate that concentration anomaly of methane family in the low_layer air can be used as an important index for petroleum geochemical exploration.
