搜索结果: 1-15 共查到“知识库 地质学 Geology”相关记录24条 . 查询时间(0.153 秒)
孙伟家等-Geology：板块汇聚迫使克拉通岩石圈被动俯冲（图）
板块汇聚 克拉 岩石圈 被动俯冲
2023/1/16
由于大陆地壳密度较低而产生的正浮力，大陆俯冲在很长的时间被认为是不可能的；但随着柯石英、斯石英等高压矿物的发现，大陆俯冲被认识到是可能的，并在随后的研究中被广泛证实。传统观点认为，大陆俯冲的主要驱动力是先期俯冲下去且密度较大的大洋板片拖拽作用。然而，大陆俯冲的具体机制依然不明确，是否存在其他机制导致大陆岩石圈俯冲？特别是克拉通型大陆岩石圈能否发生俯冲？
地球存在多个圈层，但不同圈层间相互耦合，使得地球热和构造作为整体进行演化，这种演化过程影响了地球内外圈层相互作用的方式，而内外圈层的相互作用又与地表生物圈息息相关。
李扬等-Geology：千年尺度的脉冲式成矿作用和超高的高原（图）
千年尺度 脉冲式成矿作用 超高的高原
2023/1/16
提起中酸性岩浆岩，大部分人可能很陌生，其实它们覆盖了这个星球的绝大部分陆地，以坚硬的花岗岩地板和猛烈的火山喷发走进我们的生活，还孕育了金铜铁等金属资源，提供工业化所需要的原材料。
杨传等-Geology：生命何时变大？（图）
生命 蓝田生物群 生物宏体化
2023/1/16
摘要：生物由小变大是生命演化史上的一个重要里程碑，传统观点认为大规模宏体真核生物的出现发生在575 Ma之后；我国蓝田生物群的发现表明这一过程可能发生得更早，但该生物群缺乏同位素年代学约束。李献华院士带领的多学科团队经过多年协同攻关，通过CT和XRF可视化取样和高精度Re-Os同位素分析，从蓝田生物群产出层位获得了第一个精确绝对年龄（602 ± 7 Ma）。结果表明，蓝田生物群所代表的生物宏体化比...
蔡春芳等-Geology等：盆地内甲烷产生与氧化作用（图）
盆地 甲烷产生 氧化作用
2023/1/16
甲烷不仅关系到人类赖以生存的能源问题，也被认为与地质历史上的氧化事件和雪球地球事件关系密切。一般认为，太古代大气富含甲烷，大氧化事件的可能原因之一就是甲烷生成量减少或甲烷从地球上逃逸；然而，尚不能排除甲烷的厌氧氧化作用（AOM）。现代海洋中，生物甲烷90%以上被硫酸盐所消耗，但是太古代的海洋富含铁锰而贫硫酸盐，于是科学家猜测，铁锰的还原可能是当时甲烷降低的重要原因。然后，迄今为止，在前寒武地层中尚...
Geology and Mineral Chemistry of Gold Mineralization in Mirge-Naqshineh Occurrence (Saqez, NW Iran): Implications for Transportation and Precipitation of Gold
gold quartz veins mineral chemistry EPMA Mirge-Naqshineh Iran
2018/4/10
The Mirge-Naqshineh gold district is situated at northwest of Iran with a NW-trending brittle-ductile shear zone. It is hosted by Precambrian meta-sedimentary and meta-volcanic units traversed by mine...
Geology and geochemistry of ferromanganese nodules in the Japanese Exclusive Economic Zone around Minamitorishima Island
ferromanganese nodule critical metals high acoustic reflectivity exclusive economic zone Minamitorishima Island
2017/4/10
A dense field of ferromanganese (Fe-Mn) nodules was discovered on a seamount approximately 300 km east of
Minamitorishima Island, in the Japanese Exclusive Economic Zone. To evaluate its potential as...
Mineralogy and Human Welfare:Applications in Geology, Petrology, Environmental Science and Industry; Catalog of Crystal Structures
Mineralogy Human Welfare Geology Petrology Environmental Science
2011/11/11
I lived for 17 years at Barn Close Farm, Fritchley, Derbyshire, England, UK at the southern end of the Pennine Chain. I retired on 9/30/05 as Professor of Physical Sciences at the University of Chicag...
Degenerative Permafrost Engineering Geology Features Analysis and Forecasting of National Road 214
Degenerative Permafrost Forecast National Road 214
2011/12/20
The paper is based on information of permafrost engineering geology of National Road 214, and for a comparative, analysis the permafrost engineering geology features of National Road 214, Including pe...
Kaolin Deposits and Occurrences in Africa: Geology, Mineralogy and Utilization
Kaolin Deposits and Occurrences in Africa: Geology, Mineralogy and Utilization
2012/3/14
Kaolin Deposits and Occurrences in Africa: Geology, Mineralogy and Utilization.
The Relationship Between Geology and Landslide Hazards of Atchison,Kansas,and Vicinity
Relationship Geology Landslide Hazards
2009/10/20
Landslides along the Missouri and Kansas rivers will affect existing structures and potential development in the Kansas City metropolitan area. A pilot landslide-mapping project was conducted in the v...
Cambrian-Ordovician Arbuckle Group rocks in Kansas occur entirely in the subsurface. As is demonstrated throughout this paper, the historical and current understanding of the Arbuckle Group rocks in K...
Geology of the Dereiçi (Şavsat, Artvin) Cu-Pb-Zn Deposits
Geology Dereiç i Cu-Pb-Zn Deposits
2009/7/8
The geological relationships between the rock units in the Dereiçi/Şavsat (Artvin) region and vein-type Cu-Pb-Zn deposits were presented in this paper. The study area comprises the Upper C...
Post-Collisional Magmatism on the Northern Margin of the Taurides and its Geological Implications: Geology and Petrology of the Yahyalı-Karamadazı Granitoid
Karamadazı Granitoid Geochemistry Granodiorite Leucogranite Eastern Tauride Belt Central Turkey
2009/7/8
The Karamadazı Granitoid (Yahyalı-Kayseri) is a typical example of bimodal magmatism on the northern margin of the Eastern Tauride belt. The Karamadazı Granitoid intrudes the Palaeozoic...
Geology of the Ören and Surrounding Areas, SW Anatolia
Ö ren Gö kova Neogene basin extensional tectonics
2009/7/8
On the Lycian Nappes of SW Anatolia, Neogene basins developed along two different trends in different periods. NNE-trending basins formed during the Early-Middle Miocene period as exemplified by the &...