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mantle plume 【地質學;地理學】地幔涌流〔地幔中熔融物質的巨大上升流〕...

mantle rock

Due to the west north direction subduction , fast collapse ( delamination ) may take place and the mantle plume emerged in ludong , in addition , owing to the subduction of pacific plate under eurasian , there appeared left - lateral advection and extension for tan - lu faults ( named as yishu fault in shandong ) , and together with the collapse of yanshanian orogenic belts , all induced the crustal extension in shandong 由于太平洋板塊對歐亞板塊的俯沖( nw向) ,魯東地區巖石圈發生了快速拆沉減薄作用,同時魯東地區也可能會出現地幔柱的活動;另外,在太平洋板塊俯沖作用影響下,郯廬斷裂(山東稱沂沭斷裂)帶發生了大型左行走滑剪切和拉張活動。

The results of the experiments indicate that : thermal plumes in the mantle ( i . e . mantle plumes ) should be divided into two types , vertical plumes , as mentioned traditionally , and non - vertical plumes , including those of inclined - columns , vortexes , etc . , and the former may be only a particular case of the latter ; under the condition of the coriolis force to be ignored 在忽略科里奧利力的情況下,板塊的下插和滯積下沉、巖石圈根的存在以及地幔介質粘度的非均勻分布等都可能構成不同形狀的障礙導流體,導致地幔的渦旋運動。

High - mg volcanic rocks approach the primitive mantle compositions , and their magmatic source is close to the composition of bse , derives from the lower mantle and formed by this type - mantle rocks “ fractional melting highly ( > 25 % ) . high - mg volcanic magma , formed in the axis of the emei mantle plume , underwent the crystallization differentiation of olivines and some pyroxenes ; some olivines reflect fair cumulus crystallization 高鎂火山巖接近于原始巖漿的組成,巖漿源區與地球平均成分bse的成分特征相近,起源深度為下地幔,為該地幔巖較高程度的部分熔融( 25 )而形成的。高鎂火山巖處于地幔柱的軸部,經歷了橄欖石及一定程度的輝石分異結晶,并且橄欖石顯示出一定的堆晶作用。

Beginning with the minerogenetic theory of mantle plume , the basic geological conditions of this type deposit can be summarized through studying typical copper - nickel sulfide deposits which have close bearing on continental flood basalt . in contrast with high - mg volcanic magmatic activity , it can be found that some intrusive rock bodies have ni - minerogenetic geology condiction . xilaping rocks in binchuan - chenghai region has some basic geological condiction and reflects some extent minerogenetic . all these testify this region has very larger potentiality of finding copper - nickel sulfide deposits 通過對研究區內與峨眉山玄武巖活動有關的高鎂火山巖進行研究對比,發現區內與峨眉山玄武巖同期形成某些侵入巖體具有成鎳礦(化)的地質條件。研究區內的昔臘坪巖體除了具有這些基本地質條件外,還顯示不同程度的礦化,說明該地區作為尋找鎳礦的靶區是有很大的潛力。

Applying system theory to study mineralized belt or concentrated area has been a hot topic recently . this paper applied new theory of modern seafloor hydrothermal sedimentary minerlization , sequence stratigraphy , mantle plume or hotspot and metallogenic series to study systematacially characteristic of geology and geochemistry of seafloor hydrothermal sedimentary deposits and hydrothermal sedimentary - rebuilded deposits and gold deposits 論文應用現代海底熱水沉積成礦研究成果、層序地層學、地幔熱柱或熱點理論及礦床成礦系列理論等,對本區熱水沉積型鉛鋅(銀)礦床、熱水沉積-改造型鉛鋅(銀)礦床和金礦床進行了詳細的地質地球化學研究。

The research of large igneous rock province - ermei basalt extrusion - mantle plume shows that songpan - ganzi folded belt is a hopeful target for breakthrough of petroleum exploration , and the key issue is how to make well a coupling and optimization among its faults , structures , traps and reservoirs 根據地震測深、重、磁、電等的探查,發現該褶皺帶深部有一低速高導層,而對大火成巖省峨眉玄武巖噴溢地幔柱的認識深化均表明,四川松潘甘孜褶皺帶是可望獲得油氣勘探突破的靶區,重要的是斷裂構造、圈閉、儲集層的耦合與優化。

It also implied that mother magma formed mafite was a residual melt trace elements distributed pattern is similar to transitional mid - ocean ridge basalt simultaneously , the pattern , which displayed a clear ( k ) . rb . ba , th , ( th ) - enriched , also can be explained as an ocean ridge environment overlappe d with mantle plume 其微量元素的分配形式類似于過渡類型的洋中脊玄武巖,同時表現出( k ) 、 rb 、 ba 、 th 、 ( ta )的明顯富集,也可解釋為在洋中脊環境上疊加了地幔柱的特征。

Hotspot is a window to understand mantle plume hypothesis and dynamics of mantle plume , and the area where ridge interactions with hotspot is the best place to directly find out relationship between plate tectonics and mantle plume 摘要地表熱點是認識地幔柱假說以及地幔柱動力學的窗口,發生在洋脊與熱點之間的相互作用則是了解地球上兩大動力系統(板塊構造和地幔柱)的直接聯系的最有利地區。

Based on affirming mantle plume hypothesis , the authors introduce several 2d or 3d simulation experiments about ridge - plume ( hotspot ) interaction and some examples of hotspot - ridge interactions existing in the three oceans 研究洋脊熱點之間的相互作用對于揭示地幔動力學、熱點附近洋殼構造的演變以及與熱點密切相關的洋中脊處的巖漿熱液活動具有重要的意義。

Due to the subduction of pacific palte under eurasian in early cretaceous , at about 140 ma , fast collapse ( delamination ) took place and the mantle plume emerged , both resulted in the large - scale crustal extension in ludong 3 、富集地幔源區( em1 )的產生是俯沖并熔融的揚子下地殼物質進入華北巖石圈地幔并與之相互交代作用形成的。

Olson is particularly interested in how the earth ' s core and mantle interact to produce geomagnetic fields , plate tectonics and deep mantle plumes 歐爾森對于地核與地函如何交互作用而產生地球磁場、板塊運動和地函深部的煙流特別感興趣。

Emei - mantle plume ' s activity is very violent in binchuan - chenghai region , and a lot of its axis material is exposed in this region 賓川?程海地區被認為是峨眉地幔熱柱活動的最強烈地區,也是熱柱軸部物質大量出露的地區。

Based on the summarize study of mantle plume and thermal structure , the paper divided the thermal structure into several pieces 在地幔柱和熱力構造研究進展總結的基礎上,對盆地熱力構造進行了分類。