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Assignment代写:The ophiolite

2017-12-23 来源: 51due教员组 类别: 更多范文

下面为大家整理一篇优秀的assignment代写范文- The ophiolite,供大家参考学习,这篇论文讨论了绿蛇岩。蛇绿岩,是一组由橄榄岩和少量辉长岩、玄武岩构成的岩石组合。蛇绿岩在岩石学中是一种特殊类型的岩石,对于洋陆岩石圈的构造演化、地幔深部的活动过程有重要的研究价值。同时蛇绿岩作为古大洋岩石圈的残片,对于恢复洋陆运动和构造演化过程也具有十分重要的学术意义。

ophiolite,绿蛇岩,assignment代写,paper代写,留学生作业代写

Ophiolite has been studied for more than more than 200 years, since the beginning of the concept of ophiolite, the study of Ophiolite has been progressing continuously, with the rise of the theory of plate tectonics, the ophiolite was once thought to produce in Mid-Ocean ridge, while Pengrose Conferences is a sequence of rocks that defines the ophiolite as a magnesium iron-magnesia iron. It was also recognized that the study of Ophiolite was of great significance to the understanding and transformation of the Earth, until the classification of the generation Environment was entered into people's view.

Brongniart, a French mineralogical biologist, first proposed the word "ophiolite" in 1813. Until 1927, Stienmann combined with its research work, it was pointed out that Ophiolite is a group of rock composed of olivine and a few FAI-feldspar and basalt. and Hess The research work of Steinmann on Ophiolite as a "trinity" composed of serpentine, basal volcanic rocks and flint rocks. The idea of the Trinity is different from the definition proposed by Stienmann, but it has been developed and disseminated very quickly.

With the rise of the theory of plate tectonics, the importance of ophiolite in rebuilding the continent has been paid attention to. So in 1972 in the United States held Penrose meeting to discuss the various problems of ophiolite. Pengrose conferences defines ophiolite as a special kind of MG-Fe-MG-fe rock assemblage that cannot be used as a rock name or mapping unit. And the intact Ophiolite rock assemblage should be super magnesium ultramafic, Hui long rock, magnesium iron mat rock wall and mafic volcanic rock. The definition of ophiolite in this meeting is of great significance in the history of Ophiolite research, and it is a breakthrough in the research process of ophiolite.

The concept proposed by Pengrose conferences has promoted the development of Ophiolite, but studies have found that not all ophiolite are producing oceanic ridges, which undoubtedly challenges the definition of ophiolite again, Until Dilek. A more accurate and more accurate definition of Ophiolite is concluded: The rock fragments of the upper mantle and the oceanic crust are not in situ, and the tectonic displacement of the original igneous rock slices occurs under the action of plate aggregation. Such rock slices from the bottom to the top should include an olive rock with rock Genesis and Epoch Connection, a rock sheath for intrusive rocks and volcanic rocks from the mafic to the long crust, and some of the units may be missing in the incomplete ophiolite.

In the past study of Ophiolite, geologists have put forward different classification methods according to their knowledge and research on Ophiolite. such as the Coleman of the Tethys and Cordillera-type ophiolite, Zhang Qi and other Pitzorella-type, Eastern Mediterranean and Western Mediterranean type three types of ophiolite and other classifications.

Dilek, a new classification scheme based on the generating environment is proposed, which is related to subduction and is independent of subduction.

First, the ophiolite is often seen as a fragment of an ancient oceanic shell or its associated tectonic unit in the orogenic belt, this often marks the position of subduction collision zone and plate boundary, and it can explain the process of the action of the Ocean ridge including the ground slow, which is of great significance to the study of the global Geotectonic. Among them, Ophiolite is an important basis to determine the ancient plate boundary, which not only promotes the development of plate tectonics, but also is an indispensable part of plate tectonics theory. The lithologic unit of Ophiolite can correspond to the various ring layers of modern oceanic lithosphere, so the study of Ophiolite has irreplaceable status on the complex paleo-oceanic mantle dynamics and Geotectonic studies.

Ophiolite is a special kind of rock in petrology, which has important research value for tectonic evolution of oceanic lithosphere and deep mantle activity process. At the same time, as a fragment of the Paleo-oceanic lithosphere, Ophiolite is of great academic significance for the restoration of the movement and tectonic evolution of the ocean. The study of Ophiolite is of great significance to the understanding of continental cracking and plate tectonics.

Ophiolite is closely related to the evolution of oceanic lithosphere, so it is helpful to understand the structure, change and dynamics of the oceanic lithosphere by studying the composition, structure, tectonics and kinetics of ophiolite. The article is also in the research on the basis of the study of previous research, because of my knowledge accumulation or lack of understanding and other reasons, the article may have some problems, welcome predecessors and readers criticized.

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