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Lithostructural Control of the Gold Mineralization of the Douta Permit of African Star Resources (Kédougou-Kéniéba Inlier, Southeastern Senegal)

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International Journal of Geosciences 2024年第4期15卷 303-333页

作者： Masse Ndour Papa Moussa Ndiaye Koffi Félix Ekra Alain Ndong Malick Faye Pierre Ndour African Star Resources Yoff Dakar S&#233n&#233gal Dé partement de G&#233ologie Universit&#233 Cheikh Anta Diop Dakar S&#233n&#233gal

The Douta permit of African Star Resources/Thor Explorations, located in the southeast of Senegal, in the Kédougou-Kéniéba Inlier (western part of the West African Craton), is dominated to the East by metasedimentary formations such as greywackes, shales, graphitic shales, quartzites, cherts, claystones and breccias characteristic of the Dialé-Daléma basin. To the West, the mafic formations of the Mako volcanic belt are the most common. Metasedimentary rocks are associated with metavolcanosedimentary terms found at the contact zones between the two (2) Birimian groups. These different geological formations are cut by mafic dolerite and gabbro sills and/or dykes, as well as quartz and microgranite veins. The Douta gold project is crossed from North to South by the mtz (Main Transcurrent Zone), generally oriented NE-SW and becoming N-S towards the North. The permit is characterized by several shear corridors. The rocks are affected by brittle, brittle-ductile to ductile deformations. The gold mineralization is hosted by a NE-trending shear corridor called the Makosa corridor (Makosa shear zone), therefore sub-parallel to the mtz. It has a subvertical dip (75˚ to 85˚ to the NW). It is associated with a hydrothermal phase characterized by quartz-sericite-epidote-fine, disseminated pyrite and arsenopyrite ± albite ± chlorite paragenesis. These minerals testify to the existence of a low degree of metamorphism (greenschist facies, epizonal domain) in the area. However, metamorphism reaches amphibolite facies in some places, particularly in the vicinity of intrusive bodies, with the presence of hornblende (amphiboles) and plagioclase. The gold mineralization is mainly hosted by two (2) metasedimentary lithological units: meta-greywackes and shales.

关键词： Douta Kédougou-Kéniéba Inlier Senegal Metasedimentary mtz Control Gold Mineralization Makosa Corridor

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Chemical screening reveals Ronidazole is a superior prodrug to Metronidazole for nitroreductase-induced cell ablation system in zebrafish larvae

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Journal of Genetics and Genomics 2021年第12期48卷 1081-1090页

作者： Siting Lai Ankita Kumari Jixiang Liu Yiyue Zhang Wenqing Zhang Kuangyu Yen Jin Xu Department of Developmental Biology School of Basic Medical SciencesSouthern Medical UniversityGuangzhou 510515China Division of Cell Developmental and Integrative BiologySchool of MedicineSouth China University of TechnologyGuangzhou 510006China

The Metronidazole(mtz)/nitroreductase(NTR)-mediated cell ablation system is the most commonly used chemical-genetic cell ablation method in zebrafish. This system can specifically ablate target cells under spatial and temporal control. The mtz/NTR system has become a widely used cell ablation system in biological, developmental, and functional studies. However, the inadequate cell-ablation ability of some cell types and the side effects of high concentration mtz impede extensive applications of the mtz/NTR system. In the present study, the US drug collection library was searched to extend the NTR system. Six mtz analogs were found, and the cell-ablation ability of these analogs was tested in zebrafish larvae. The results revealed that two of the NTR substrates, Furazolidone and Ronidazole, ablated target cells more efficiently than mtz at lower concentrations. Furthermore, the working concentration of Ronidazole, but not Furazolidone and mtz, did not affect axonal bridge formation during spinal cord regeneration. Our results,taken together, indicate that Ronidazole is a superior prodrug to mtz for the NTR system, especially for the study of neuron regeneration in zebrafish larvae.

关键词： mtz Ronidazole NTR Cell ablation Regeneration Zebrafish

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Hydration effects on crystal structures and equations of state for silicate minerals in the subducting slabs and mantle transition zone

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Science China Earth Sciences 2016年第4期59卷 707-719页

作者： YE Yu State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences

There are potentially huge amounts of water stored in Earth's mantle, and the water solubilities in the silicate minerals range from tens to thousands of part per minion(ppm, part per million). Exploring water in the mantle has attracted much attention from the societies of mineralogy and geophysics in recent years. In the subducting slab, serpentine breaks down at high temperature, generating a series of dense hydrous magnesium silicate(DHMS) phases, such as phase A, chondrodite, clinohumite, etc. These phases may serve as carriers of water as hydroxyl into the upper mantle and the mantle transition zone(mtz). On the other hand, wadsleyite and ringwoodite, polymorphs of olivine, are most the abundant minerals in the mtz, and able to absorb significant amount of water(up to about 3 wt.% H_2O). Hence, the mtz becomes a very important layer for water storage in the mantle, and hydration plays important roles in physics and chemistry of the mtz. In this paper, we will discuss two aspects of hydrous silicate minerals:(1) crystal structures and(2) equations of state(Eo Ss).

关键词：硅酸盐矿物地幔过渡带水合作用状态方程晶体结构俯冲带地球物理 mtz

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国外期刊内燃机论文题录

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内燃机工程 1991年第2期12卷 85-86页

作者：郝朱袁

关键词：发动机 SAE 进气 mtz 轿车客车热力发动机内燃机直喷式柴油机涡轮增压器

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Ophiolites as Archives of Recycled Crustal Material Residing in the Deep Mantle

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Acta Geologica Sinica(English Edition) 2017年第S1期91卷 49-页

作者： YANG Jingsui Paul T.ROBINSON Yildirim Dilek CARMA Institute of GeologyChinese Academy of Geological Sciences Department of Geology & Env.Earth Science Miami University

Deeply subducted lithospheric slabs may reach to the mantle transition zone(mtz,410-660 km depth)or even to the core–mantle boundary(CMB)at depths of^2900km.Our knowledge of the fate of subducted surface material at the mtz or near the CMB is poor and based mainly on the tomography data and laboratory experiments through indirect methods.Limited data come from the samples of deep mantle diamonds and their mineral inclusions obtained from kimberlites and associated rock assemblages in old cratons.We report in this presentation new data and observations from diamonds and other UHP minerals recovered from ophiolites that we consider as a new window into the life cycle of deeply subducted oceanic and continental crust.Ophiolites are fragments of ancient oceanic lithosphere tectonically accreted into continental margins,and many contain significant podiform chromitites.Our research team has investigated over the last 10 years ultrahigh-pressure and super-reducing mineral groups discovered in peridotites and/or chromitites of ophiolites around the world,including the Luobusa(Tibet),Ray-Iz(Polar Urals-Russia),and 12 other ophiolites from 8orogenic belts in 5 different countries(Albania,China,Myanmar,Russia,and Turkey).High-pressure minerals include diamond,coesite,pseudomorphic stishovite,qingsongite(BN)and Ca-Si perovskite,and the most important native and highly reduced minerals recovered to date include moissanite(Si C),Ni-Mn-Co alloys,Fe-Si and Fe-C phases.These mineral groups collectively confirm extremely high?pressures(300 km to≥660 km)and super-reducing conditions in their environment of formation in the mantle.All of the analyzed diamonds have unusually light carbon isotope compositions(δ13C=-28.7 to-18.3‰)and variable trace element contents that*d i stinguish them from most kimberlitic and UHPmetamorphic varieties.The presence of exsolution lamellae of diopside and coesite in some chromite grains suggests chromite crystallization depths around>380 km,near the mantle transition zone.The carbon isotopes and othe

关键词： CMB mtz Ophiolites as Archives of Recycled Crustal Material Residing in the Deep Mantle

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国外期刊内燃机论文题录

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内燃机工程 1989年第4期 82-84页

作者：何郝朱袁郑

★.合禅途*1 989年高速柴油机技木综述····“···一HsDDI,89.5、‘汽车发动机可命性技术入门···““·,t一内健祖四,1铭,.4川崎重工小型发动机技术的发展与研究 ...........................·..·.····.····……内裸... 详细信息

★.合禅途*1 989年高速柴油机技木综述····“···一HsDDI,89.5、‘汽车发动机可命性技术入门···““·,t一内健祖四,1铭,.4川崎重工小型发动机技术的发展与研究 ...........................·..·.····.····……内裸祖陇,1始,.5小型二冲程汽油机的发展史··········一内艘滋阳,1兜,.5车用汽油机“····”、························一内燕珊四,1兜9.,车用柴油机······························……内燃栩阴,1兜叭7小型渔船用柴油机·····················…

关键词：柴油机气缸盖 SAE 混合气汽油车用 mtz 燃料油热力发动机内燃机发动机

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国外期刊内燃机论文题录

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内燃机工程 1991年第3期 82-84页

作者：郝朱袁杨郑

关键词：内燃机 mtz SAE 车用直喷式热力发动机发动机柴油机喷油泵

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国外期刊内燃机论文题录

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内燃机工程 1990年第2期 84-86页

作者：何郝朱袁郑

☆井合评述☆电控发动机控制系统发展趋势及最佳微型计算机的开发 SAE paPer 8e0t36未来设计师用的软件手段SAE paPer 880031内燃机的排气热能利用和生态指标及0,1989.111989年舷外机的伎术状况mtz,1989.11小型内燃机的研究成果KFT,1989... 详细信息

☆井合评述☆电控发动机控制系统发展趋势及最佳微型计算机的开发 SAE paPer 8e0t36未来设计师用的软件手段SAE paPer 880031内燃机的排气热能利用和生态指标及0,1989.111989年舷外机的伎术状况mtz,1989.11小型内燃机的研究成果KFT,1989.11Perkins Eagle TX柴油机用于重型卡车 mtz一1989.12De.tz MWM具有10、7250 kw发动机 mtz,1989.11日本二冲程车用发动机的发展内燃掇阴,1990.1调控技术的发展协寸刁技掇,,989 .81☆整机研倒☆日本五十铃陶瓷发动机研制现状SAE PaPer 880011美国

关键词：发动机 SAE mtz 内燃机热力发动机柴油机压燃发动机

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Iron Isotopic Fractionation and Origin of Chromitites in the Paleo-Moho Transition Zone of the Kop Ophiolite, NE Turkey

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Acta Geologica Sinica(English Edition) 2017年第S1期91卷 53-页

作者： ZHAGN Pengfei ZHOU Meifu SU Benxun Ibrahim UYSAL Paul T.ROBINSON Erdi AVCI HE Yongsheng Department of Earth Science The University of Hong Kong State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences Department of Geological Engineering Karadeniz Technical University State Key Laboratory of Geological Processes and Mineral Resources School of Earth Sciences and Mineral ResourcesChina University of Geosciences

The Kop ophiolite in NE Turkey is a fragment of Neo-Tethyan forearc.It can be mainly divided into a paleo-Moho transition zone(mtz)in the North and a harzburgitic mantle sequence in the South.Dunites are predominant in the mtz of the Kop ophiolite,and they are locally interlayered with chromitites and enclose minor bodies of harzburgites near the petrological Moho boundary.Large Fe isotopic variations were observed for magnesiochromite(-0.14‰to 0.06‰)and olivine(-0.12‰to 0.14‰)from the mtz chromitites,dunites and harzburgites.In individual dunite samples,magnesiochromite usually has lighter Fe isotopic compositions than olivine,which was probably caused by subsolidus Mg-Fe exchange between the two mineral phases.Both magnesiochromite and olivine display an increasing trend ofδ56Fe along a profile from chromitite todunite.This trend reflects continuous fractional crystallization in a magma chamber,which resulted in heavier Fe isotopes concentrated in the evolved magmas.In each cumulative cycle of chromitite and dunite,dunite was formed from relatively evolved melts after massive precipitation of magnesiochromite.Mixing of more primitive and evolved melts in the magma chamber was a potential mechanism for triggering the crystallization of magnesiochromite,generating chromitite layers in the cumulate pile.Before mixing happened,the primitive melts had reacted with mantle harzburgites during their ascendance;whereas the evolved melts may lie on the olivine-chromite cotectic near the liquidus field of pyroxene.Variable degrees of magma mixing and differentiation are expected to generate melts with differentδ56Fe values,accounting for the Fe isotopic variations of the Kop mtz.

关键词： mtz Iron Isotopic Fractionation and Origin of Chromitites in the Paleo-Moho Transition Zone of the Kop Ophiolite NE Turkey Fe

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MgO－TiO_2－ZnO系高压MLC瓷料的研究

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电子元件与材料 1996年第3期15卷 25-27页

作者：吴顺华吴国桥赵玉中吕素兰天津大学国营798厂

研究了ＭｇＯ－ＴｉＯ２－ＺｎＯ（ＭＴＺ）系高压ＭＬＣ介质陶瓷的结构和介电性能。ＸＲＤ分析表明：其主晶相是六方晶系ＭｇＴｉＯ３以及少量的ＺｎＴｉＯ３、ＣａＴｉＯ３附加晶相。此种瓷料制成多层陶瓷电容器，具有耐高压、高工作... 详细信息

研究了ＭｇＯ－ＴｉＯ２－ＺｎＯ（ＭＴＺ）系高压ＭＬＣ介质陶瓷的结构和介电性能。ＸＲＤ分析表明：其主晶相是六方晶系ＭｇＴｉＯ３以及少量的ＺｎＴｉＯ３、ＣａＴｉＯ３附加晶相。此种瓷料制成多层陶瓷电容器，具有耐高压、高工作频率等优点。

关键词：多层陶瓷电容器高压电容器 MLC mtz

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