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Geochemistry and Geochronology of diorite in Pengshan Area of Jiangxi Province:Implications for Magmatic Source and Tectonic Evolution of Jiangnan Orogenic Belt

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Journal of Earth Science 2020年第1期31卷 23-34页

作者： Hongfeng Shi Junpeng Wang Yuan Yao Jing Zhang Song Jin Yingxin Zhu Kang Jiang Xiaolong Tian Deng Xiao Wenbin Ning Nanjing Geological Survey Center China Geological SurveyTVaw/zwg 210016China State Key Laboratory of Geological Processes and Mineral Resources Hubei Key Laboratory of Critical Zone EvolutionCenter for Global TectonicsSchool of Earth SciencesChina University of GeosciencesWuhan 430074China Institute of Natural Resources and Environment Audit Nanjing Audit UniversityNanjing 211815China Hebei Bureau of Geology and Mineral Resources Exploration Shijiazhuang 050081China

Magmatic activities associated with tectonic events play a significant role in understanding the evolution of an orogenic *** Jiangnan orogenic belt has been regarded as the collisional suture zone between the Yangtze Block and the Cathaysia *** the magmatic activities during the period of intra-plate extension after the collision have been well studied in recent years,some remaining issues,including source nature and geodynamic mechanism,need to be further *** this paper,based on a detailed field geological,petrological,geochemical and geochronological study,we focus our work on diorites in the Pengshan area located at the northwestern margin of the Jiangnan orogenic *** mineral assemblages are mainly composed of plagioclase(55 vol.%-65 vol.%)and hornblende(35 vol.%-45 vol.%).One diorite sample yields zircon^(206)Pb/^(238)U mean age of 768±8 Ma(MSWD=0.29).The diorites have enriched large ion lithophile elements(Ba,K and Rb)and incompatible elements(Th and U),and are depleted in high field-strength elements including Ta,Ti and *** in this study have relatively high MgO content(6.56 wt.%-7.58 wt.%,7.07 wt.%on average)and Mg number values(65-67,65.8 on average).The diorites are metaluminous,high K calc-alkaline series rocks with high contents of K_2O(1.59 wt.%-1.97 wt.%)and total alkali(Na_2O+K_2O=5.56 wt.%-6.05 wt.%).The Nd/Th ratio(4.34-5.27)is higher than that of crust-derived rocks and lower than mantle-derived *** Rb/Sr ratio(0.19-0.22)is slightly lower than crust,but significantly higher than upper *** on the above geochemical and geochronological analyses,we suggest that the diorites in the Pengshan area were mainly derived from crustal materials with a small amount of mantleoriginated materials involved,and possibly produced from an extensional tectonic setting after the collision between the Yangtze Block and Cathaysia Block.

关键词： Neoproterozoic diorite geochemistry Pengshan area Jiangnan orogenic belt

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Petrogenesis of Paleoproterozoic diorite porphyries inLuojiazhuang, western Shandong： constraints fromLA-ICP-MS zircon U-Pb geochronology and geochemistry

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Global Geology 2016年第2期19卷 78-84页

作者： YANG Haotian SHI Jiangpeng HUO tengfei YANG Donghong College of Earth Sciences Jilin University Changchun 130061 China Research Center of Palaeontology & Stratigraphy Jilin University Changchun 133026 China

Based on the study of LA-ICP-MS zircon U-Pb geochronology and whole-rock geochemistry for theLuojiazhuang diorite porphyries in Menying , western Shandong , the analyzed zircons exhibit oscillatory zoning in the cathodoluminescence images and have high Th/U ratios （0. 15-1.53） , indicating a magmatic *** addition, most of the zircons have narrow metamorphic edges, suggesting that late metamorphic eventsmay exist. The youngest group of magmatic zircon 207Pb/206Pb ages rangng from 2 384 Ma to 2 234 Ma, yieldinga weighted mean age of 2 353 ± 14 Ma, which represents the forming age of the diorite porphyries, as theEarly Paleoproterozoic. Geochemically , the samples are characterized by low Si〇2（54. 54% and 55. 47% ）,high MgO （5.22% and 5.49% ） and Mg# values （58 and 59） . Moreover , they show enrichment of light rareearth elements and large ion lithophile elements （ Rb , Ba and K） , depletion of heavy rare earth elements andhigh field strength elements （Nb, Ta , Zr and Hf） , positive anomaly of Pb , and negative anomaly of Ti. Thefact implies that the Luojiazhuang diorite porphyries might derive from partial melting of mantle and mixed with an amount of continental crust material. In summary , they may tectonic setting that stretching along the east-＂west direction at the North China Craton in the Early Paleoproterozoic.

关键词： Paleoproterozoic diorite porphyry geochronology geochemistry western Shandong

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Zircon U-Pb geochronology and geochemistry of diorite dikes from Nancha ore deposit in Tonghua area of Jilin and its geological significance

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Global Geology 2017年第1期20卷 21-31页

作者： WU Qiong SUN Fengyue WANG Li LIU Jinlong TIAN Lidan WANG Fei College of Earth Sciences Jilin UniversityChangchun 130061China

The authors presented geochronology and geochemical data of diorites from Nancha gold deposit in Tonghua region, with the aim to constraining its formation age, magma source and tectonic setting. LA-ICP-MS U-Pb dating results of zircons from the diorites indicate that the rocks were formed in the Middle Jurassic （171 ±2 Ma, MSWD = 1. 19）. Geochemically, these rocks have Si02 concentrations of 52. 52%-54. 90%,K20 of 2. 14%-3.84% , Na20 of 3. 17%-3. 35% , MgO of 7. 43%-9. 34% and high Mg# of 68. 57-72. 57. These rocks are characterized by enrichment in large ion lithophile elements（ LILE,such as K, Ba, Rb and Sr） and light rare earth elements （ LREE） , relatively depletion in high field strength elements （ HFSE, such as Ta, Nb, Ti and Zr） , and heavy rare earth elements （HREE）. These characteristics suggest that primary magma of the rocks were derived from the partial melting of mantle with miner crustal contamination, which may related to partial melting of mantle wedge by addition of sediment melt from subducting oceanic crust. Based on former and present studies, the authors consider that the Nancha ore deposit high-Mg diorites were formed in compres- sional structural setting which is similar to volcanic arc. It could be related to the subduction of the Paleo-Paci- fic plate beneath the Eurasian continent.

关键词： zircon U-Pb chronology geochemistry diorite Nancha gold deposit Tonghua Jilin

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Age and generation of Fogang granite batholith and Wushi diorite-hornblende gabbro body

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Science China Earth Sciences 2007年第2期50卷 209-220页

作者： XU XiSheng LU WeiMin HE ZhenYu State Key Laboratory of Crust-Mantle Evolution and Mineralization Department of Earth SciencesNanjing UniversityNanjing210093China

Fogang granitic batholith, the largest Late Mesozoic batholith in the Nanling region, has an exposure area of ca. 6000 km2. Wushi diorite-homblende gabbro body is situated at the northeast part of the batholith. Both the granitic batholith main body and the diorite-homblende gabbro body belong to high-K calc alkaline series. Compared with the granitic main body, the Wushi body has lower Si (49%–55%), higher Fe, Mg, Ca, lower REE, less depletion of Eu, Ba, P, Ti, and obvious depletion of Zr, Hf. Zircon LA-ICP-MS dating and the mineral-whole rock isochron dating reveal that Fogang granitic main body and Wushi body were generated simultaneously at ca. 160 Ma. The Fogang granitic main body has high (87Sr/86Sr)i ratios (0.70871–0.71570) and low ? Nd(t) values (?5.11–?8.93), suggesting the origins of the granitic rocks from crustal materials. Their Nd two-stage model ages range from 1.37–1.68 Ga. The Sr and Nd isotopic compositions and the Nd model ages of the granitic rocks may suggest that the giant Fogang granitic main body was generated from a heterogeneous source, with participation of mantle component. Wushi diorite-homblende gabbro is an unusual intermediate-basic magmatic rock series, with high (87Sr/86Sr)i ratios (0.71256–0.71318) and low ? Nd(t) values (?7.32–?7.92), which was possibly formed through mixing between the mantle-derived juvenile basaltic magma and the magma produced by the dehydration melting of lower crustal basaltic rocks.

关键词： granite higher initial 87Sr/86Sr diorite isotopic dating source component Nanling

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Variations of clinopyroxene/melt element partitioning during assimilation of olivine/peridotite by low-Mg diorite magma

Variations of clinopyroxene/melt element partitioning during...

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中国科学院地质与地球物理研究所2015年度（第15届）学术年会

作者： Qing Qian J?rg Hermann Yanling Wang Jinghui Guo Fu Liu Luojuan Wang Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences CAS Center for Excellence in Tibetan Plateau Earth Sciences Research School of Earth Sciences The Australian National University Department of Earth and Environment Sciences University of Rochester State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences

The effects of crystal chemistry and melt composition on the control of clinopyroxene/melt element partitioning(D)during the assimilation of olivine/peridotite by felsic magma have been investigated in Mesozoic high-Mg diorites from North *** assimilation resulted in significant increase of Mg,Cr and Ni and only slight(73-79,D1.2)are elevated by up to an order of magnitude(for REE and Y)or more(for Zr and Hf)at similarAl,indicating dominant control of melt composition/*** Dshow a larger sensitivity to the compositional change of crystal and melt than *** for the low-and high-Mg zonings show a uniform dependence *** Dare insensitive to the compositional change of clinopyroxene and melt,resulting in Sr depletions in the clinopyroxene zonings with elevated REE without crystallization of *** observations show that crystal chemistry and melt composition/structure may alternatively control clinopyroxene/melt partitio

关键词： Clinopyroxene Trace element partition coefficients Compositional effect Assimilation of olivine/peridotite diorite

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Petrogenesis of Shangyu gabbro-diorites in western Shandong:Geochronological and geochemical evidence

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Science China Earth Sciences 2008年第4期51卷 481-492页

作者： YANG ChengHai XU WenLiang YANG DeBin WANG Wei WANG WeiDe LIU JinMin College of Earth Sciences Jilin UniversityChangchun 130061China Shandong Bureau of Geology and Mineral Resources Jinan 250013China

Chronology and geochemistry of the Shangyu gabbro-diorite in western Shandong were studied to understand their petrogenesis and the nature of the Mesozoic lithospheric mantle. The Shangyu intru-sion is mainly composed of a suite of gabbro-diorite. Zircons from the intrusion display eu-hedral-subhedral in shape and have high Th/U ratios (1.23―2.87), implying their magmatic origin. LA-ICP-MS zircon U-Pb dating results for two samples indicate that they were formed in the Early Cre-taceous, yielding weighted mean 206Pb/238U ages of 129±1Ma and 134±2Ma, respectively. Except for early cumulate such as sample QT-19, their SiO2 and MgO contents range from 50.12% to 56.37% and from 3.52% to 6.37%, respectively. Moreover, the gabbro-diorites are characterized by high Mg# (0.54―0.63), enrichment in Na (Na2O/K2O ratios more than 1), Cr (73×10-6―217×10-6) and Ni (34×10-6―241×10-6), and intensive enrichments in light rare earth elements (LREEs) and large ion lithophile elements (LILEs) and depletion in high field strength elements (HFSEs). Their initial 87Sr/86Sr ratios and ε Nd(t) values range from 0.70962 to 0.71081 and from-16.60 to-13.04, respectively. Taken together with the Early Creta-ceous high-Mg diorites and the mantle xenoliths from the Tietonggou and Jinling as well as basalts from the Fangcheng and Feixian, it is suggested that the primary magma for the Shangyu gab-bro-diorites should be derived from the enriched lithospheric mantle intensively modified by conti-nental crust. The Sr-Nd-Pb isotopic compositions for the Early Cretaceous high-Mg diorites in western Shandong display a trend of spatial variations, i.e., initial 87Sr/86Sr, 207Pb/204Pb and 208Pb/204Pb ratios de-creasing and ε Nd(t) values increasing from southeast to northwest in western Shandong, which is con-sistent with the tectonic model that the Yangtze Craton subducted beneath the North China Craton oriented in north-west direction in the Early Mesozoic.

关键词： High-Mg diorite geochemistry zircon U-Pb dating petrogenesis Mesozoic western Shandong

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U-Pb geochronology,geochemistry and tectonic implications ofdiorite from Nangnimsan of Mehe in northern Da Hinggan Mountains

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Global Geology 2017年第4期20卷 217-228页

作者： YIN Yue WANG Li SUN Xia JIANG Hefang LI Liang College of Earth Sciences Jilin University Bureau of Land and Resources of Laizhou City Shandong Province

LA-ICP-MS zircon U-Pb dating indicates that the weighted average age of diorite from Nangnimsan,Mohe in the northern Da Hinggan Mountains in Heilongjiang Province is 516.2±1.7 Ma,as a result of magmatic intrusion of Early Cambrian. Geochemistry analysis indicates that the rocks belong to high-K calc-alkaline series,with low content of SiO_2( 52.24%-53.64%) and high Mg( MgO = 5.67%-6.56%,Mg~#= 61. 05-65. 46).The rocks are characterized by the enrichment of LREE and LILE( e.g. Rb,Ba,Pb),and relative depletion in HREE and HFSE( e.g. Ta,Nb,P,Ti),and with a high content of Sr( 442. 3-622. 3) × 10^(-6),Yb( 2.49-3.42) ×10^(-6) and Y( 25.64-35.49) ×10^(-6),and slightly negative Eu anormaly( δEu= 0.60-0.81). Based on Rb/Sr( 0.15-0.25) and Rb/Nb( 8.27-15.12),it is concluded that the primary magma of diorite was derived from the mixture of the crust and mantle. Combined with background of regional tectonic evolution,it is suggested that diorite was formed in the extensional environment after the collage of the EGM with the Siberian.

关键词： Nangnimsan diorite U-Pb geochronology geochemistry extension environment

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New Occurrence of Gold Mineralization at the Eastern Part of Wadi El Gemal, South Eastern Desert, Egypt

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Open Journal of Geology 2020年第12期10卷 1210-1233页

作者： Mohamed Salem Kamar Nuclear Materials Authority El Maadi Cairo Egypt

The basement rock units of the study area are represented by metasediments-metavolcanics association, diorite rocks, granodiorites and syenogranites. The whole sequence is cut by basic dykes, pegmatites and different quartz (jasper) veins. Metasediments-metavolcanics association is represented by hornblende schist and metadacite respectively. There is visible sulfides mineralization in hornblende schist, metadacite and diorite rocks at their contacts at the wadi level. So, polished sections were prepared to study opaque minerals under the ore microscope, which reveals the presence of gold, pyrite and goethite. The radioactivity of this area is weak, where the average eU contents in metasediments-metavolcanics association, diorites, granodiorites, syenogranites, pegmatites and jasper veins are 2.8 ppm, 1.9 ppm, 3.26 ppm, 4.91 ppm, 4.32 ppm and 6.7 ppm respectively. The intrusion of granodiorite rocks may act as a source for hydrothermal solutions ascending along fractures of all older rocks. During this stage, a chemical reaction of hydrothermal fluids with metasediments-metavolcanics association and diorite rocks lead to forming sericite and enrichment of silica content. The enrichment of silica content led to the formation of quartz-diorite. Also, iron derived from the host rocks and sulfur from the hydrothermal fluids could have formed pyrite while the gold was precipitated at the contact between metasediments-metavolcanics association and diorite rocks.

关键词： Wadi El Gemal Gold Metasediments-Metavolcanics Association diorite Egypt

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Fluid Inclusion Investigations of the Masjed Daghi Copper-Gold Porphyry-Epithermal Mineralization, East Azerbaijan Province, NW Iran

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Open Journal of Geology 2017年第8期7卷 1110-1127页

作者： Solat Atalou Nima Nazafati Mohammad Lotfi Mehraj Aghazadeh Department of Geology Science and Research Branch Islamic Azad University Tehran Iran Department of Geology North Tehran Branch Islamic Azad University Tehran Iran Department of Geology Payame Nour University Tehran Iran

The Masjed Daghi mineralization is located 30 km southeast of Jolfa city at the bank of Araxes River, northwest Iran. This area is situated in the Alborz-Azarbaijan structural zone of Iran. The most widespread rocks in the mineralization area are andesite and trachyandesite, while there are rock units of latite tuff, andesitic agglomerate, and hornblende porphyry basalt in eastern hills and Eocene flysch in the southern part of the area. Several intrusive bodies are present in the study area, from which the dominant intrusive rock hosting the mineralization is diorite porphyry. The mineralized rock units of the area are cut by different diorite ad mafic dikes. The most prevalent texture of mineralization is dissemination, while open space filling textures including veins and veinlets, are common as well. Diverse types of alteration including potassic, phyllic, argillic, silicification, and a little of carbonatization were recognized in the field and microscopic observations as well as by XRD. In addition to thick silica veins and stockwork zones, some silica, barite, sulfide, and calcite veins and veinlets have occurred in the Masjed Daghi mineralization area. In this research, 26 doubly polished thin sections (wafers) were prepared and investigated. Four samples were taken from surface veins, while 22 samples were chosen from core samples (of 6 boreholes) of white and grey-white silica, and silica-barite veins. The fluid inclusion studies on 105 primary fluid inclusions indicated five phases for inclusions including: 1) liquid or gas, 2) liquid and gas, 3) liquid, gas, and solid, 4) liquid, gas, halite, and solid, and 5) liquid, gas, halite, and two types of solids. The data gained from fluid inclusions approved two mineralization fluids which caused porphyry and epithermal mineralizations. The porphyry fluid inclusions were homogenized in temperatures of 122°C to 550°C with a maximum of 700°C and average salinity of 55 wt% NaCl equivalent, while the epithermal inc

关键词： Fluid Inclusion Porphyry Mineralization Epithermal Alteration diorite Masjed Daghi Siyah Roud

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Geology of Gold Ore Deposits in Western Linyi of Shandong Province,China

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Global Geology 2003年第1期8卷 69-81页

作者： Tiebing Liu Qingdong Zeng Yuanchao Shen Guangming Li Institute of Geology and Geophysics Chinese Academy of SciencesInstitute of Geology and GeophysicsChinese Academy of SciencesInstitute of Geology and GeophysicsChinese Academy of SciencesInstitute of Geology and GeophysicsChinese Academy of Sciences Beijing100029 ChinaBeijing100029 ChinaBeijing100029 ChinaBeijing100029 China

Western Linyi of Shandong Province is one of the most important gold ore mineralization concentration areas. Mesozoic gold ore deposits in this area can be subdivided into two types: magmatic hydrothermal and epithermal gold deposits. The occurrences of gold ore bodies are controlled by structures. Related subvolcanic rocks can be subdivided into high potassium calc-alkali series and alkaline series. These two types of subvolcanic rocks are of different geochemical features and different sources. The high potassium calc-alkali rocks are derived from enriched mantle and contribute to the formation of magmatic hydrothermal gold ore deposits including skarn gold-copper ore deposit and porphyry gold ore deposit. Alkaline rocks are derived from lower crust and they host epithermal gold deposits. Comprehensive studies show that there is no evolutionary or transitional relationship temporally and genetically between the epithermal gold deposit and the high temperature magma hydrothermal gold deposit in the western Linyi.

关键词： magmatic hydrothermal gold deposit, epithermal gold deposit, diorite porphyry, syenite porphyry,western Linyi

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