Supercritical fluid and granitic melt are commonly generated as pressure decreases during exhumation of deeply subducted continental crust from mantle depths,promoting crust–mantle interaction,changing the rheology o...Supercritical fluid and granitic melt are commonly generated as pressure decreases during exhumation of deeply subducted continental crust from mantle depths,promoting crust–mantle interaction,changing the rheology of material along much of the subduction channel and,in a feedback loop,facilitating ongoing exhumation.However.展开更多
Gneisses with anatectic characteristics from the Liansan island in the Sulu UHPM(ultra-high pressure metamorphic)belt were studied for petrography,titanite U-Pb dating and mineral geochemistry.Three origins of garnets...Gneisses with anatectic characteristics from the Liansan island in the Sulu UHPM(ultra-high pressure metamorphic)belt were studied for petrography,titanite U-Pb dating and mineral geochemistry.Three origins of garnets are distinguished:metamorphic garnet,peritectic garnet and anatectic garnet,which are formed in the stages of peak metamorphism,retrograde anatexis and melt crystallization,respectively.The euhedral titanite has a high content of REE and high Th/U ratios,which is interpreted as indicating that it was newly-formed from an anatectic melt.The LA-ICP-MS titanite U-Pb dating yields 214-217 Ma ages for the titanite(melt)crystallization.The distribution of trace elements varies in response to the different host minerals at different stages.At the peak metamorphic stage,Y and HREE are mainly hosted by garnet,Ba and Rb by phengite,Sr,Nb,Ta,Pb,Th,U and LREE by allanite and Y,U and HREE by zircon.During partial melting,Y,Pb,Th,U and REE are released into the melt,which causes a dramatic decline of these element contents in the retrograde minerals.Finally,titanite absorbs most of the Nb,U,LREE and HREE from the melt.Therefore,the different stages of metamorphism have different mineral assemblages,which host different trace elements.展开更多
Destruction of the North China Craton has caused extensive concern on its multiple potential mechanisms including thermal erosion,chemical erosion and delamination.It is widely accepted that thinning of the
The Archean North China Craton is composed of the Western Block,Eastern Block and the intervening Central Orogenic Belt.A 4-10 km wide and 85 km long tectonic mélange belt informally called the Zanhuang tectonic
目的探讨颌骨原发性骨淋巴瘤(primary bone lymphoma,PBL)临床特点及影像学表现。方法收集郑州大学第一附属医院2014年1月至2019年4月符合纳入标准的14例颌骨PBL患者的临床资料,对发病年龄、性别、部位、主诉及影像学表现等进行回顾性...目的探讨颌骨原发性骨淋巴瘤(primary bone lymphoma,PBL)临床特点及影像学表现。方法收集郑州大学第一附属医院2014年1月至2019年4月符合纳入标准的14例颌骨PBL患者的临床资料,对发病年龄、性别、部位、主诉及影像学表现等进行回顾性分析。结果14例颌骨PBL患者中男性10例,女性4例;年龄范围4~79岁,中位年龄56岁;上颌骨单发6例,下颌骨单发7例,同时累及上颌骨和下颌骨1例;12例以局部肿物为主诉入院,2例主诉口内肿物伴黏膜表面溃疡或脓肿形成;4例伴牙松动,3例有患侧牙痛史,2例有唇颊部麻木症状,1例出现发热及盗汗等全身症状。影像学表现为溶骨型骨质破坏者8例,混合型4例,硬化型1例,囊状型1例;1例伴骨膜反应,12例见明显肿块,且以骨质破坏程度轻而软组织肿块范围大为特征。结论颌骨PBL常见于中老年男性,上下颌骨均可累及。临床及影像学表现缺乏特征性,可出现牙痛、牙松动及感觉异常等常见牙体或牙周症状,但软组织肿物体积大而骨质破坏程度轻的影像学特点可作为其与骨髓炎、鳞状细胞癌及骨肉瘤等疾病鉴别诊断的重要依据。展开更多
基金supported by the National Natural Science Foundation of China(42072228,41572182,41272225)the project from Chinese Ministry of Education(BP071922)
文摘Supercritical fluid and granitic melt are commonly generated as pressure decreases during exhumation of deeply subducted continental crust from mantle depths,promoting crust–mantle interaction,changing the rheology of material along much of the subduction channel and,in a feedback loop,facilitating ongoing exhumation.However.
基金supported by funds from the National Natural Science Foundation of China(Grant Nos.42172067,41972064,U1906207)the SDUST Research Fund。
文摘Gneisses with anatectic characteristics from the Liansan island in the Sulu UHPM(ultra-high pressure metamorphic)belt were studied for petrography,titanite U-Pb dating and mineral geochemistry.Three origins of garnets are distinguished:metamorphic garnet,peritectic garnet and anatectic garnet,which are formed in the stages of peak metamorphism,retrograde anatexis and melt crystallization,respectively.The euhedral titanite has a high content of REE and high Th/U ratios,which is interpreted as indicating that it was newly-formed from an anatectic melt.The LA-ICP-MS titanite U-Pb dating yields 214-217 Ma ages for the titanite(melt)crystallization.The distribution of trace elements varies in response to the different host minerals at different stages.At the peak metamorphic stage,Y and HREE are mainly hosted by garnet,Ba and Rb by phengite,Sr,Nb,Ta,Pb,Th,U and LREE by allanite and Y,U and HREE by zircon.During partial melting,Y,Pb,Th,U and REE are released into the melt,which causes a dramatic decline of these element contents in the retrograde minerals.Finally,titanite absorbs most of the Nb,U,LREE and HREE from the melt.Therefore,the different stages of metamorphism have different mineral assemblages,which host different trace elements.
文摘Destruction of the North China Craton has caused extensive concern on its multiple potential mechanisms including thermal erosion,chemical erosion and delamination.It is widely accepted that thinning of the
文摘The Archean North China Craton is composed of the Western Block,Eastern Block and the intervening Central Orogenic Belt.A 4-10 km wide and 85 km long tectonic mélange belt informally called the Zanhuang tectonic
文摘目的探讨颌骨原发性骨淋巴瘤(primary bone lymphoma,PBL)临床特点及影像学表现。方法收集郑州大学第一附属医院2014年1月至2019年4月符合纳入标准的14例颌骨PBL患者的临床资料,对发病年龄、性别、部位、主诉及影像学表现等进行回顾性分析。结果14例颌骨PBL患者中男性10例,女性4例;年龄范围4~79岁,中位年龄56岁;上颌骨单发6例,下颌骨单发7例,同时累及上颌骨和下颌骨1例;12例以局部肿物为主诉入院,2例主诉口内肿物伴黏膜表面溃疡或脓肿形成;4例伴牙松动,3例有患侧牙痛史,2例有唇颊部麻木症状,1例出现发热及盗汗等全身症状。影像学表现为溶骨型骨质破坏者8例,混合型4例,硬化型1例,囊状型1例;1例伴骨膜反应,12例见明显肿块,且以骨质破坏程度轻而软组织肿块范围大为特征。结论颌骨PBL常见于中老年男性,上下颌骨均可累及。临床及影像学表现缺乏特征性,可出现牙痛、牙松动及感觉异常等常见牙体或牙周症状,但软组织肿物体积大而骨质破坏程度轻的影像学特点可作为其与骨髓炎、鳞状细胞癌及骨肉瘤等疾病鉴别诊断的重要依据。
