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Discovery and Geological Significance of Neoproterozoic Metamorphic Granite in Jimo, Shandong Province, Eastern China 被引量:3
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作者 ZHU Decheng lü dawei +4 位作者 SHEN Xiaoli YANG Qing lI Dandan REN Tianlong YANG Shipeng 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2016年第6期2080-2096,共17页
During the 1:50000 regional geological survey in Jimo, east Shandong Province, Paleoproterozoic metamorphic supracrustal rocks and Neoproterozoic metamorphic plutonite were newly discovered. These rocks displayed inc... During the 1:50000 regional geological survey in Jimo, east Shandong Province, Paleoproterozoic metamorphic supracrustal rocks and Neoproterozoic metamorphic plutonite were newly discovered. These rocks displayed inclusions which had occurred in the Mesozoic granite, and the main lithologies are schist, granulite, marble, and granitic gneiss. Geochemical analyses suggest that Neoproterozoic metamorphic plutonite are characterized by high-K, metaluminous to weakly peraluminous. They are enriched in LILE and depleted in HFSE, with moderately enrichment of LREE, weak fractionation of LREE from HREE and negative Eu anomalies. The surface age of plutonic rocks in the survey area is 770.2±2.4 Ma, representing the age of magma crystallization, which is agreement with the the Neoproterozoic magmatic event after Rodinia supercontinent in the northern margin of Southern China continental block. In addition, the age of sporadic distribution (298 Ma and 269 Ma) is mixed zircon age, representing the rocks experienced metamorphism in Indosinian period. According to the associated mineral assemblages, and the characteristic metamorphic minerals and temperature pressure conditions, four metamorphic facies were identified, including amphibolitic, epidote amphibolite, greenschist, and mid-high pressure greenschist. Analysis of tectonic setting suggests that granitic gneiss is formed in an extensional environment and was involved from the continental margin magmatic arc to intraplate environment. Jimo is distributed in the east of Zhuwu fault, and has the same Spatial distribution location with the Weihai uplift UHP metamorphic belt rocks. The metamorphic rocks in Jimo area have similar geochemical characteristics of elements, tectonic setting and retrograde metamorphism with that in the Sulu UHP metamorphic belt. Therefore, Zhuwu fault may be the boundary fault of Sulu UHP metamorphic belt. 展开更多
关键词 metamorphic supracrustal rock metamorphic granite metamorphic facies Jimo Zhuwu fault
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古土壤干湿特征指示晚古生代气候演化
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作者 吕大炜 张奥聪 +6 位作者 张之辉 高远 王东东 刘海燕 徐锦程 王洛静 田兴 《地质论评》 CAS CSCD 北大核心 2023年第2期551-562,共12页
古土壤是地质历史时期气候变化的重要记录者,通过古土壤记录的信息,可以定性和定量重建深时古环境和古气候,为认识地质历史时期的各种地质事件提供依据。前人大多对特定区域展开古土壤研究,对全球性古土壤数据的整理和古气候、古环境研... 古土壤是地质历史时期气候变化的重要记录者,通过古土壤记录的信息,可以定性和定量重建深时古环境和古气候,为认识地质历史时期的各种地质事件提供依据。前人大多对特定区域展开古土壤研究,对全球性古土壤数据的整理和古气候、古环境研究相对较少。基于古土壤的干湿情况对古气候环境的指示作用,我们按照植物根迹、根系结构与根化石、黏土矿物以及古土壤的结构构造等依据,将前人报道的古生代(410~255 Ma)古土壤分为干旱古土壤和湿润古土壤两种类型。将古土壤干湿特征与其他气候敏感性沉积物进行对照,显示为干旱古土壤分布与钙质结核以及蒸发岩等指示干旱气候带的敏感性沉积物分布一致,湿润古土壤分布与高岭石、煤以及铝土矿等指示湿润气候带的敏感性沉积物分布一致。干旱古土壤大都分布在晚古生代中低纬度干旱地区;湿润古土壤大都分布在晚古生代赤道附近及中纬度湿润地区。通过以上分析认为,古土壤干湿特征可以作为一个新的气候敏感指标指示古气候环境,进而作为划分气候带的有力依据。 展开更多
关键词 古土壤 古气候分带 晚古生代 气候敏感性沉积物 古气候重建
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PET小包装油瘪瓶问题的技术改善
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作者 孙玉萍 刘启东 +2 位作者 陈伟 吕大伟 胡金华 《中国油脂》 CAS CSCD 北大核心 2021年第11期145-147,共3页
针对市售5 L PET小包装油瘪瓶问题进行了研究和技术改善。从PET瓶热收缩、灌装工艺、调油罐脱臭油试验进行瘪瓶原因分析,发现瘪瓶与调油罐脱臭油吸气量高有关。通过油品吸气量检测方法对脱臭油、储存罐、调油罐、灌装首件4个进油环节吸... 针对市售5 L PET小包装油瘪瓶问题进行了研究和技术改善。从PET瓶热收缩、灌装工艺、调油罐脱臭油试验进行瘪瓶原因分析,发现瘪瓶与调油罐脱臭油吸气量高有关。通过油品吸气量检测方法对脱臭油、储存罐、调油罐、灌装首件4个进油环节吸气量进行了定量分析,结果发现:进油方式为“上进下出”的吸气量远低于“下进下出”的,因此将“下进下出”进油方式调整为“上进下出”;调油罐脱臭油吸气量控制在35 cm以下可有效避免PET小包装油产品出现瘪瓶现象。 展开更多
关键词 PET小包装油 瘪瓶 进油环节 吸气量 下进下出 上进下出
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