Preface

本专辑收录了中国地质科学院2016—2017年部分博士研究生的毕业论文摘要和部分博士后的出站报告摘要, 共计21篇。     

Preface

正1Deepwater Settings of Marginal Seas——the Frontier of Oil and Gas Exploration From the perspective of geographical environment, the areas of global oil and gas exploration can be divided into land, shallow water and deep water areas. The timespan of oil and gas discovery in each field is different. Oil and gas have been discovered on land since ancient times,     

Preface

Mathematical Geosciences -     

Preface

<正>The impact of human activities on the groundwater has become more and more intense,and the global climate warming and drying trend has become more increasingly obvious.How we could keep sustainability of groundwater utilization under such intense geological and environmental disasters caused by excessive exploitation of groundwater becomes one of the important topics on sustainable development in the world.     

Preface

Abstract

The Pearl River Delta in SE China is commonly believed as originating from continuous subsidence of the basement fault-(bounded) blocks initiated at the about 60 ka B.P. A section recently exposed at Xilingang in the hinterland of the Pearl River Delta, however, reveals that the fault-block movement is likely periodic or paroxysmal. Quaternary system of the section can be divided into three parts named as layer A, B and C from the bottom upwards. Both layer A and B are alluvial while layer C is aeolian. OSL dating of sediments proves that layer A is older than 43 ka, layer B in between 43-23ka and layer C younger than 23ka. The unconformable contact with a dip angle larger than 30° between layer A and B suggests a paroxysmal tilting and subsidence of basement fault-blocks after the formation of layer A. The upper interface of layer B is about 20 meters high above the sea level while that in the delta plain used to be buried at 20 meters under the S.L., implying a relatively rapid uplifting of the Xilingang hill after formation of layer B. Three layers, i.e. layer A, B and C are all cut off by a NNE trending normal fault with a fault-throw of 53cm, suggesting that the third paroxysmal movement of fault-blocks in the Pearl River Delta were occurred in recent epoch.