Geopulsation, Volcanism and Astronomical Periods     

Yang Xuexiang  Chen Dianyou  Yang Xiaoying  Yang Shuchen 《世界地质(英文版)》2000,3(1)

Volcanism is mainly controlled by the intermittent release of energy in the earth. As far as the differential rotation of the earth's inner core is concerned, the Galactic Year may change the gravitational constant G, the solar radiative quantity and the moving speed of the solar system and affect the exchange of angular momentum between core and mantle as well as the energy exchange between crust and mantle. As a result, this leads to eruptions of superplumes and magma, and controls the energy flow from core - mantle boundary (CMB) to crust. When the earth' s speed decreases, it will release a huge amount of energy. They are the reason of the correspondence of the volcanic cycles one by one with the astronomical periods one by one. According to the astronomical periods, volcanic eruptions may possibly be predicted in the future.  相似文献   

Zircon U-Pb and Lu-Hf isotopic systematics of the Daping plutonic rocks: Implications for the Neoproterozoic tectonic evolution of the northeastern margin of the Indochina block, Southwest China   总被引：2，自引：0，他引：2  

Xuexiang Qi  Lingsen ZengLuhua Zhu  Zhaocuo HuKejun Hou 《Gondwana Research》2012,21(1):180-193

The Daping Neoproterozoic plutonic rocks at the northeastern margin of Indochina block in southwest China provide an ideal opportunity for studying the tectonic setting and relationship between the Indochina and Yangtze Blocks. LA-ICP-MS U-Pb dating on the zircon cores and rims of a hornblende-gabbro yield ²⁰⁶Pb/²³⁸U weighted means ages of 873 ± 9.1 Ma and 769 ± 7 Ma, respectively, and that for cores, mantles and rims of a granodiorite yield ²⁰⁶Pb/²³⁸U weighted means ages of 981-987 Ma, 829 ± 10 Ma and 761 ± 11 Ma, respectively. The zircon cores and mantles are interpreted as inherited from their source region. The zircon rims are magmatic, their ages represent the emplacement timing. The zircon cores and rims from the hornblende-gabbro have ε_Hf^(t) values ranging from − 5.0 to − 5.8 and + 0.6 to + 6.4. Corresponding single-stage model ages range from 1626 to 1662 Ma and 1094 to 1311 Ma, respectively. For the granodiorite, the inherited mantles (including cores) show two groups: (1) ε_Hf^(t) values of + 3.3 to + 12.3 with single-stage Hf model ages of 897 to 1235 Ma; and (2) ε_Hf^(t) values of − 1.9 to − 7.8 with single stage model ages of 1470-1667 Ma. The zircon rims are characterized by positive ε_Hf^(t) values (+ 5.4 to + 8.2) with single-stage model ages ranging from 977 to 1108 Ma. Whole-rock geochemical data for the hornblende-gabbro, such as enrichment of LILE and LREE, negative anomaly of Nb and Ta, and high Mg^# (52.1-65.4), suggest magma generation in a subduction-related setting. An island-arc affinity is strongly supported by the features of high-alumina basalt and abundant hornblende in a large hornblende-gabbro sill. The granodiorites are characterized by high Sr contents and Sr/Y ratios, strong enrichment of LILE and LREE, and negative anomaly of Nb, Ta, P and Ti, comparable with the features of subduction-related plutonic rocks. These data show that the hornblende-gabbro was generated by the partial melting of a metasomatized mantle wedge peridotite with contribution from aqueous fluids derived from a subducted slab. The granodiorite magma is a product of the mixing of mafic magma produced by partial melting of a slab-fluid-enriched metasomatized mantle wedge peridotite and felsic magma formed by the partial melting of crustal materials. The emplacement ages and geochemical features of subduction-related Daping plutonic rocks are the same as those reported from the western margin of the Yangtze block, suggesting the presence of an oceanic crust in between, with subduction to either side generating island-arc magmatism in the Neoproterozoic.  相似文献   

The Effect of Tide on the Global Climate Change     

YANG Xuexiang  CHEN Zhen  CHEN Dianyou 《东北亚地学研究》2002,(2)

1　ＰｒｅｓｅｎｔＳｉｔｕａｔｉｏｎｏｆＲｅｓｅａｒｃｈｆｏｒＧｌｏｂａｌＣｌｉｍａｔｅＲｅｃｅｎｔｌｙ ,ｔｈｅｒｅｓｅａｒｃｈｆｏｒｔｈｅｇｌｏｂａｌｃｌｉｍａｔｅｃｈａｎｇｅｓｃａｕｓｅｄｂｙｔｉｄｅｈａｓａｃｈｉｅｖｅｄｒｅｍａｒｋａｂｌｅｒｅｓｕｌ  相似文献   

岩石圈伸缩的机制和规模   总被引：1，自引：1，他引：0  

杨学祥  陈震  陈殿友 《大地测量与地球动力学》1996,(3)

岩石圈形变是各种力源综合作用的结果。数值计算表明，地球内热积累产生的热膨胀是岩石圈深大断裂的力源，日月引潮力等是岩石圈反复蠕变积累能量后产生大规模运动的力源。这个结论与已知的地质资料相吻合  相似文献   

“Smashing the Moon”Accelerating Global Warming     

Xuexiang Yang    Dianyou Chen . College of Geo-exploration Science  Technology  Jilin University  Changchun  China . National Astronomical Observatories  Chinese Academy of Sciences  Beijing  China . College of Mathematics Science  Jilin University  Changchun  China 《东北亚地学研究》2003,(2)

At the beginning of the 21st century, the world is facing too many natural and artificial disasters, and man is also facing various decisions difficult to be made. The evidence for the earth warming-up is more clear year by year and natural disaster occurs frequently and economic loss in miserable situation, moreover, the evil consequence from the lose of control technologically, overage development is more serious year after year and the daily ecological envi-ronment of man is trending toward…  相似文献   

地球自转、极移与地壳形变     

杨学祥  王莉 《大地测量与地球动力学》1995,(2)

由于地球表面是球面，所以地表任何方向的水平运动实际上都是转动。地球自转所产生的离心力矩是大陆离极运动的原因，由此而产生的极移使地球发生相应的形变。计算表明，极移是大规模地壳运动和地震活动的原因之一。  相似文献   

内蒙古柳坝沟金矿床原生晕地球化学特征及深部成矿远景评价   总被引：5，自引：0，他引：5       下载免费PDF全文

章永梅  顾雪祥  程文斌  董树义  景亮兵  王立强  张岩  沈阳  黄志全  张兴顺 《地学前缘》2010,17(2):209

文中系统论述了柳坝沟金矿床的多金属元素原生晕地球化学特征,运用多元统计方法,结合地球化学各参数信息,勾勒出矿区原生晕异常形态,建立了元素轴向分带序列,探讨金矿床剥蚀程度并建立了原生晕叠加模型。认为柳坝沟金矿床西段头尾晕共存,Sb、Bi反分带,显示出多阶段叠加成矿的特点,是下部有盲矿体存在的反映;东段基本属正向分带序列,地球化学参数较强的波动,可能预示着深部有盲矿体存在。313号脉西段矿体遭受一定剥蚀,矿段中段和东段遭受轻微剥蚀。综合分析推断西段深部矿化远景较好,中段较好异常分布在海拔高度1400 m以上的较浅部位,东段深部前景最佳;为矿区深部找矿提供了重要依据。  相似文献   

贵州水银洞金矿床成矿流体不混溶的包裹体证据   总被引：10，自引：2，他引：8       下载免费PDF全文

李保华  顾雪祥  付绍洪  徐仕海  陈翠华  董树义 《地学前缘》2010,17(2):286

通过对水银洞金矿床中流体包裹体的观测和热力学参数计算,探讨了成矿流体不混溶的热力学条件。研究结果表明,该矿床石英中的流体包裹体分为H_2O包裹体、CO_2包裹体和CO_2-H_2O包裹体三大类,并以富含CO_2-H_2O包裹体为特征,CO_2-H_2O包裹体可进一步划分为富H_2O相CO_2-H_2O包裹体和富CO_2相CO_2-H_2O包裹体。加热时富H_2O相CO_2-H_2O包裹体完全均一成H_2O相;而富CO_2相CO_2-H_2O包裹体完全均一成CO_2相,而且二者的完全均一温度和完全均一压力一致,说明它们是同时期捕获的CO_2-低盐水不混溶流体包裹体组合。它们形成时的热力学条件是:形成温度236℃,形成压力324 bar(1bar=10~5Pa);共存两相流体密度:低盐水相0.900 g/cm~3,CO_2相0.314 g/cm~3;共存两相中CO_2的摩尔分数:低盐水相0.0376,CO_2相0.7337;水溶液含盐度w(NaCl)约为1.3%。  相似文献   

杂多酸络合物及其与热液成矿元素组合的关系   总被引：8，自引：0，他引：8  

刘建明  周渝峰 《矿物岩石》1994,14(4):76-84

杂多酸是一种含多种金属－非金属阳离子的多元络合物，在适当条件下可能成为成矿元素热液迁移的重要形式。杂多酸络合物作为某些成矿组合的共同载体能使它们共同进入地球化学迁移并生成一定的元素共生组合，本文以川西北低温热液的Ａｕ－Ｓｂ－Ｗ－Ａｓ建造矿床为例，初步讨论了钨的杂多酸对元素热液迁移的重要意义，并以此解释了钨这一高温热液成矿元素常常在许多中－低温热液矿床中与锑、砷等低温成矿元素稳定共生的地球化学机制。  相似文献   

全球海面变化的两极冰盖模型   总被引：1，自引：0，他引：1  

杨学祥  王瑞庭 《地球科学进展》1993,8(4):66-69

在Clark等(1976)提出的在粘弹性地球上全球海面变化的数值模型和笔者(1992)提出的一极冰盖质点模型的基础上,考虑冰盖在两极的实际分布,建立两极冰盖质点分布的数理模型。计算结果表明,一极模型中海面变化的的极值区在S极,而两极模型中海面变化极值区在南半球的中纬度地区。  相似文献