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辽宁昌图地区下二台群盘岭组火山岩年代学及地球化学特征被引量:8
2016年
本文对昌图地区下二台群盘岭组变质火山岩进行了年代学和地球化学分析。盘岭组角闪变粒岩中锆石阴极发光图像显示,锆石呈半自形晶-自形晶,发育晶棱和清晰的岩浆振荡环带,且具有较高的Th/U比值(0.31-2.5),表明其为岩浆成因。LA-ICP-MS U-Pb定年结果显示,27个测点的206 Pb/238 U加权平均年龄348±4.4 Ma,代表了角闪变粒岩原岩的形成时代。角闪变粒岩SiO2含量为54.01%,全铁(TFe2O3)含量为15.04%,Mg#值为33.29,属于亚碱性拉斑玄武岩系列。岩石地球化学分析表明,角闪变粒岩相对富集轻稀土元素和大离子亲石元素,亏损重稀土元素和高场强元素,具有活动大陆边缘火山岩的特征。通过Hf/3-Th-Nb/16、Hf/3-Th-Ta等图解投点分析,结合区域构造演化历史,认为角闪变粒岩原岩形成于活动大陆边缘。因此,推断华北板块北缘东段早石炭世为活动大陆边缘,并受到古亚洲洋板块的俯冲作用。
韩作振郭志平高丽华宋志刚韩梅刘固耀钟文健李晶晶闫俊磊
关键词:活动大陆边缘古亚洲洋
吉林省景台-乐山地区晚二叠世岩浆岩成因及其地质意义
中亚造山带在中国东北地区的部分称为兴蒙造山带,兴蒙造山带北邻西伯利亚板块,南接华北板块,东部为太平洋板块,该地区在古生代期间受古亚洲洋构造域的控制,中生代期间又遭受了古太平洋构造域和蒙古-鄂霍茨克构造域的叠加作用,因此对...
宋志刚
关键词:岩浆岩成岩作用岩相学地球化学特征
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吉林省“大黑山条垒带”晚古生代火山事件及其构造意义被引量:6
2017年
对出露于吉林省"大黑山条垒带"、行政区辖属伊通县发展乡一带的"大黑山火山岩"-安山质凝灰熔岩、片理化流纹岩分别采样并挑选锆石,经LA-ICP-MS定年,查明安山质凝灰熔岩74颗锆石的^(206)Pb/^(238)U年龄介于1 873~240 Ma,其中^(206)Pb/^(238)U年龄值介于317~240 Ma的69粒锆石均显示出岩浆成因特征,表明研究区自晚石炭世晚期便存在火山事件,火山喷发活动于早、中二叠世发展至峰期,该火山岩形成于晚石炭世晚期至晚二叠世,并于早、中三叠世遭受了岩浆作用;古元古代、中元古代、中泥盆世及早石炭世锆石具碎屑锆石特征,可能为被捕获的古老锆石。片理化流纹岩38粒锆石的^(206)Pb/^(238)U年龄介于307~240 Ma,且均显示出岩浆成因特征,表明该火山岩形成于早二叠世早期至晚二叠世,并遭受了印支期岩浆作用。所研究的"大黑山火山岩",前人多认为其与同地区桃山组地层时代相当,为早志留世或中志留世,但本文所获该火山岩的年龄表明二者年龄时限完全不同,故大黑山火山岩与桃山组地层应完全要剥离开来,分属不同时代残留的构造岩片。上述火山岩富集轻稀土元素和大离子亲石元素,亏损高场强元素,表现出类似岛弧或活动大陆边缘火山岩的特征;在Th-Ta-Hf/3三角图和Nb/Th-Zr/Nb和Nb/Yb-Th/Yb构造环境判别图中投点在火山弧火山岩、活动大陆边缘附近,表明该火山岩可能与当时古亚洲洋板块向松嫩地块俯冲所形成的火山弧有关。
韩作振宋志刚高丽华韩梅郭志平钟文建李晶晶杜庆祥闫俊磊刘辉
关键词:二叠纪古亚洲洋锆石U-PB定年地球化学
断层对砂岩胶结物和砂岩物性变化的控制作用--以惠民凹陷临南洼陷夏503井断层为例被引量:5
2014年
惠民凹陷临南洼陷夏503井断层附近致密砂岩的碳酸盐胶结物含量远高于远离断层的正常砂岩,为探讨其形成机理及对断层封堵的影响,本文对夏503井断层附近岩芯开展全岩矿物、铸体薄片、阴极发光、同位素以及物性等分析.研究表明:致密砂岩中δ13C为0.1‰~0.6‰(平均0.42‰),δ18O为-13.5‰~-12.3‰(平均-13.1‰),碳氧同位素投点分布于中低温热液白云岩区;根据占位关系、阴极发光以及碳氧同位素特征,认为碳酸盐胶结物的形成可划分为四期:第一期方解石,第二期白云石,第三期铁白云石,第四期铁方解石;碳酸盐胶结物含量与储层物性呈负相关关系,断层附近致密砂岩的孔隙度、渗透率、排驱压力分别为4.8%,0.37 mD和1.97 MPa,与远离断层正常砂岩的14.3%,3.73 mD,0.27 MPa相比,相差一个数量级;经计算,不考虑对接盘的岩性,仅由于碳酸盐胶结的影响,致密砂岩与正常砂岩的排驱压力差就可以封堵41 m高的油柱.
高丽华韩作振韩豫韩超尉菲菲秦祯
关键词:低温热液
吉林中部地区三叠系碎屑岩物源及其地质意义
本文以吉林中部地区三叠系碎屑岩为研究对象,利用锆石LA-ICPMS U-Pb定年技术,确定该区碎屑岩的沉积时限;通过对碎屑岩的主量元素、微量元素岩石地球化学特征的研究,结合多种地球化学图解和碎屑锆石年代学物源分析,探讨了...
钟文建
关键词:碎屑锆石三叠系物源分析地质特征
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Characterization of calcium deposition induced by Synechocystis sp. PCC6803 in BG11 culture medium被引量:7
2014年
Calcium carbonate (CaCO3) crystals in their preferred orientation were obtained in BG11 culture media inoculated with Synechocystis sp. PCC6803 (inoculated BG11). In this study, the features of calcium carbonate deposition were investigated. Inoculated BGll in different calcium ion concentrations was used for the experimental group, while the BGll culture medium was used for the control group. The surface morphologies of the calcium carbonate deposits in the experimental and control groups were determined by scanning and transmission electron microscopy. The deposits were analyzed by electronic probe micro-analysis, Fourier transform infrared spectrum, X-ray diffraction, thermal gravimetric analysis and differential scanning calorimetry. The results show that the surfaces of the crystals in the experimental group were hexahedral in a scaly pattern. The particle sizes were micrometer-sized and larger than those in the control group. The deposits of the control group contained calcium (Ca), carbon (C), oxygen (O), phosphorus (P), iron (Fe), copper (Cu), zinc (Zn), and other elements. The deposits in the experimental group contained Ca, C, and O only. The deposits of both groups contained calcite. The thermal decomposition temperature of the deposits in the control group was lower than those in the experimental group. It showed that the CaCO3 deposits of the experimental group had higher thermal stability than those of the control group. This may be due to the secondary metabolites produced by the algae cells, which affect the carbonate crystal structure and result in a close-packed structure. The algae cells that remained after thermal weight loss were heavier in higher calcium concentrations in BGll culture media. There may be more calcium- containing crystals inside and outside of these cells. These results shall be beneficial for understanding the formation mechanism of carbonate minerals.
闫华晓韩作振赵辉周仕学迟乃杰韩梅寇小燕张艳徐琳琳田晨晨秦松
关键词:BIOMINERALIZATION
南黄海中部隆起晚白垩世以来地层剥蚀的磷灰石裂变径迹分析被引量:3
2018年
南黄海中部隆起自印支期以来经历显著的构造隆升及剥蚀过程.基于大陆架科学钻探CSDP-2井的钻井岩心,应用磷灰石裂变径迹技术研究了南黄海中部隆起晚白垩世以来的剥蚀过程及响应特征.所获得的8个磷灰石样品的裂变径迹年龄显示出两个年龄组,除单个样品为38±3Ma外,其余样品都集中在(52±4)^(65±5)Ma范围内,基本反映了同一期构造热事件年龄,并且均远小于样品所处的二叠纪年龄,表明样品完全退火并记录了晚白垩世以来的热历史.样品热史模拟结果表明,基于泥岩镜质体反射率计算的最高古地温处于样品退火带温区范围内,各样品从晚白垩世早期(约100Ma)以来经历持续的降温过程,在约80~75Ma开始进入部分退火带.南黄海中部隆起第一期快速冷却降温过程出现在晚白垩世末期,并持续至古新世早期,随后进入古近纪表现为持续相对缓慢的降温过程,降温幅度约30℃,渐新世末期到中新世早期存在另一期快速冷却过程.热史模拟结果较好地指示了南黄海中部隆起晚白垩世以来的地层剥蚀响应特征.
庞玉茂郭兴伟韩作振张训华朱晓青
关键词:地层剥蚀磷灰石裂变径迹低温热年代学
Geochronology and geochemistry of Permo-Triassic sandstones in eastern Jilin Province(NE China): Implications for final closure of the Paleo-Asian Ocean被引量:7
2019年
In the eastern part of the Central Asian Orogenic Belt(CAOB) in northeastern(NE) China, scattered outcrops of molasse deposits mark the ending of an orogeny and are crucial for understanding the evolution of the Paleo-Asian Ocean(PAO). However, the timing of tectonic events and the relationships among these strata remain controversial. To better constrain these geologic events, a comprehensive study of the detrital zircon U-Pb geochronology and geochemistry of the sandstones of the Kaishantun(KST) Formation and Kedao(KD) Group in eastern Jilin Province, NE China, was conducted. The KST Formation is traditionally considered a molasse deposit. The sandstones display low CIA, PIA and high ICV values and low Th/U and Rb/Sr ratios, which suggest that the rocks were derived from an immature intermediate-felsic igneous source and experienced a simple sedimentary recycling history with relatively weak chemical weathering. LA-ICP-MS U-Pb dating of detrital zircons from two samples of the KST Formation yields ages of 748-252 Ma, suggesting that the KST Formation was deposited between 254.5 Ma and 252 Ma in Late Permian. The zircons were mainly derived from the continental northern part of the North China Craton(NCC). In contrast, the U-Pb dating of detrital zircons from five samples of the KD Group yields ages of 2611-230 Ma, suggesting that the KD samples were deposited in the Early to Middle Triassic(ca. 248-233 Ma). The detrital zircon ages for the KD samples can be divided into groups with peaks at 2.5 Ga, 1.8 Ga, 800-1000 Ma, 500 Ma and 440-360 Ma, which suggest that the samples were derived from bidirectional provenances in the Jiamusi-Khanka Block and the NCC. These new data,combined with previously published results, suggest that at least three orogenic events occurred in central-eastern Jilin Province during the Early Permian(270-262 Ma), Early Triassic(254-248 Ma) and Middle-Late Triassic(242-227 Ma). The final closure of the PAO occurred during 242-227 Ma in the Middle-Late Triassic along the Changchun-Yanji sut
Qingxiang DuZuozhen HanXiaoli ShenChao HanZhigang SongLihua GaoMei HanWenjian Zhong
关键词:DETRITALMOLASSEOROGENIC
吉林永吉地区南楼山组火山岩锆石U-Pb年代学及地球化学特征被引量:7
2018年
通过对吉林永吉地区南楼山组玄武安山质凝灰岩中锆石阴极发光图像分析,锆石晶形较好,内部结构比较清晰,具有中基性岩典型的板状环带,且Th/U比值较高,介于0.73~1.52,反映了其岩浆成因的特点。LA-ICPMS U-Pb测年结果显示,12个测点的^(206)Pb/^(238)U加权平均年龄为176.6±3.8 Ma,表明玄武安山质凝灰岩的形成时代为早—中侏罗世。地球化学分析结果显示,玄武安山质凝灰岩中相对富集轻稀土元素和大离子亲石元素,而相对亏损重稀土元素和高场强元素,反映了岛弧或活动大陆边缘火山岩的特点;在Th-Ta-Hf/3三角图和Th/YbTa/Yb构造环境判别图中,投点集中在陆缘弧型钙碱性火山岩区,揭示其形成于与大洋俯冲作用相关的构造背景,结合区域构造演化,其形成于古太平洋板块向欧亚板块俯冲背景下。
韩作振闫俊磊刘辉刘辉韩梅宋志刚李晶晶
关键词:锆石U-PB定年地球化学
渤海湾盆地济阳坳陷北部石炭系—二叠系残留地层沉积相被引量:2
2021年
渤海湾盆地济阳坳陷北部石炭系—二叠系残留地层为近年来该地区油气勘探的重点领域。为明确古潜山储集层沉积相带与砂体展布规律,在地层划分对比的基础上,依据测井曲线、沉积构造、岩性特征及沉积序列等资料,对济阳坳陷北部石炭系—二叠系古潜山区沉积特征进行了系统研究。结果发现:(1)古潜山区石炭系—二叠系残留地层厚度变化很大,石千峰组被剥蚀殆尽;(2)石炭纪—二叠纪研究区经历了海陆交互相→海陆过渡相→河流相的演化过程,其中本溪组及太原组沉积时期研究区发育潟湖、潮坪及障壁岛相,山西组沉积时期发育三角洲相,以三角洲平原亚相为主,可识别出分流河道、分流河道间、天然堤及泥炭沼泽等微相,而上、下石盒子组沉积时期以辫状河沉积为主,可进一步划分为心滩、河床滞留沉积及泛滥平原微相;(3)受沉积环境演化的控制,本溪组—太原组的砂体呈斑块状展布,山西组和上、下石盒子组的砂体呈近北东—南西向条带状展布。对济阳坳陷北部潜山区沉积相与砂体展布规律的研究,为该古潜山区的油气勘探提供了关键地质依据。
杨仁超李阳汪勇李文厚赵永福
关键词:渤海湾盆地石炭系二叠系沉积相砂体展布
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