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831.
High-resolution oxygen isotope records over the last 2249 ka (MIS 1–86) have been obtained from cores of the upper section
(105.08 m) at ODP Site 1143 (water depth of 2772 m) drilled in the Nansha area, southern South China Sea. The sampling resolution
is at about 2 ka intervals, resulting in one of the best oxygen isotope records over the global ocean. The oxygen isotope
curves, displaying details in the Pleistocene glacial cycles, have revealed a nearly 300 ka long stage of transition from
a predominant 40 ka to 100 ka periodicity. Therefore, the “Mid-Pleistocene Revolution” should be considered as a process of
transition rather than an abrupt change. Within the 100 ka glacial cycles, the changes in tropical sea surface water were
found to lead those in high-latitude ice sheet. Our comparisons show that the ice sheet expansion and the glacial stage extension
in the Northern Hemisphere with the 100 ka cycles must have been driven not by ice sheet itself, but by processes outside
the high latitudes of the Northern Hemisphere. 相似文献
832.
The local meteoric water line (MWL) has been established from north to south of the Tibetan Plateau based on the measured
results of δD and δ18O in precipitation and river water, and the relationship between MWL and moisture origins discussed. The spatial and seasonal
variations ofd in precipitation and river water on the Tibetan Plateau have been studied. Results show that the spatial and seasonal variations
ofd between north and south of the Tanggula Mountains are related to different moisture origins and water recycling. 相似文献
833.
Yangming Zhu 《中国地球化学学报》2001,20(1):73-87
Based on the compositions and distributions of biomarkers in thirty-five representative oil samples, oils from the Tarim Basin of northwestern China are mainly divided into two oil families. One oil family contains relatively low amounts of C15-C20 isoprenoid hydrocarbons and shows pristane predominance with Pr/Ph ratios ranging from 1.50 to 3.00. The GC/MS analytical data of these oils show the occurrence of abundant hopanes, and low concentrations of steranes and tricyclic terpanes with hopanes/steranes ratios from 6.25 to 12.24 and tricyclic terpanes/hopanes ratios from 0.03 to 0.24. These oils contain low drimane relative to homodrimane (C15/C16 < 1.0) and abundant rearranged bicyclanes in bicyclic sesquiterpanes. They are dominated by low carbon number (C19-C21) compounds in the tricyclic terpanes, and are rich in rearranged hopanes, C29Ts and an unknown C30 compound in pentacyclic triterpanes. These geochemical characteristics suggest that the oils were generated mainly from terrigenous organic matter. The other oil family shows remarkably different biomarker compositions and distributions. The oils revealed Pr/Ph ratios of about 1.0, high drimane/homodrimane ratios (>1.0), low hopanes/steranes ratios (0.65–2.50), high tricyclic terpanes/hopanes ratios (0.30–2.00) and a dominant peak at C23 in tricyclic tepanes, suggesting a marine organic origin. Oil-source rock correlation indicates that these two oil families seem to have been derived from Mesozoic Jurassic-Triassic terrestrial source rocks (shales and coal seams) and Lower Paleozoic Ordovician-Cambrian marine source rocks, respectively. 相似文献
834.
During the early Middle Devonian in South China, an extensive carbonate platform was broken up through extension to create a complex pattern of platforms, and interplatform basins. In Givetian and Frasnian carbonate successions, five depositional facies, including peritidal, restricted shallow subtidal, semi‐restricted subtidal, intermediate subtidal and deep subtidal facies, and 18 lithofacies units are recognized from measured sections on three isolated platforms. These deposits are arranged into metre‐scale, upward‐shallowing peritidal and subtidal cycles. Nine third‐order sequences are identified from changes in cycle stacking patterns, vertical facies changes and the stratigraphic distribution of subaerial exposure indicators. These sequences mostly consist of a lower transgressive part and an upper regressive part. Transgressive packages are dominated by thicker‐than‐average subtidal cycles, and regressive packages by thinner‐than‐average peritidal cycles. Sequence boundaries are transitional zones composed of stacked, high‐frequency, thinner‐than‐average cycles with upward‐increasing intensity of subaerial exposure, rather than individual, laterally traceable surfaces. These sequences can be further grouped into catch‐up and keep‐up sequence sets from the long‐term (second‐order) changes in accommodation and vertical facies changes. Catch‐up sequences are characterized by relatively thick cycle packages with a high percentage of intermediate to shallow subtidal facies, and even deep subtidal facies locally within some individual sequences, recording long‐term accommodation gain. Keep‐up sequences are characterized by relatively thin cycle packages with a high percentage of peritidal facies within sequences, recording long‐term accommodation loss. Correlation of long‐term accommodation changes expressed by Fischer plots reveals that during the late Givetian to early Frasnian increased accommodation loss on platforms coincided with increased accommodation gain in interplatform basins. This suggests that movement on faults resulted in the relative uplift of platforms and subsidence of interplatform basins. In the early Frasnian, extensive siliceous deposits in most interplatform basins and megabreccias at basin margins correspond to exposure disconformities on platforms. 相似文献
835.
通过某工业城市大型一级导线网观测成果的限差检验、观测数据处理,探讨导线网平差时、,边、角验权的合理选择和匹配,及其对平差结果的精度影响,从中得出一些认识和有益的经验。 相似文献
836.
837.
提出了用lnσ等距分层和Tschebyscheff多项式沿垂直方向展开气象要素的方案;并证明:在绝热无耗散且时间和水平方向要素连续的情况,可以在高精度条件下,保证质量和能量守恒,且具有正确的动、位能之间的转换关系。数值计算表明:两方案均有较高的计算精度;在积分静力方程时,位势高度计算误差显著小于EC79方案。 相似文献
838.
839.
计算机仿真模型的灵敏度分析,是仿真建模中的重要研究内容,对实际系统的建立和优化具有重要意义。本文主要研究了在用蒙特卡洛方法仿真随机系统时,其仿真模型(输出)的灵敏度(导数、梯度、Hessian矩阵等),对系统性能函数和灵敏度的参数估计进行了探讨,并结合实际应用系统,对结论进行了分析比较。 相似文献
840.
利用多种描述复杂现象的非线性方法处理了多台多项多年的前兆观测资料,通过“场”、“源”特征差异性的对比求得地震危险地点是一个能量“振荡”型积累的地区,具体表现为它是在前兆异常演化过程中出现的异常从属度最高、自相似性变化最大、前兆分维数下降最多的地区,而且还是在地震活动过程中出现的一个熵值相对较低的地区。研究结果还表明,震中位置的不确定性随着发震时刻的逼近而不断减弱 相似文献