排序方式: 共有104条查询结果,搜索用时 250 毫秒
71.
72.
73.
新疆准噶尔盆地南缘郝家沟组和八道湾组底部孢粉组合及三叠系-侏罗系界线 总被引:7,自引:0,他引:7
新疆乌鲁木齐郝家沟剖面郝家沟组及八道湾组底部的孢粉分为 3个组合。即郝家沟组的 Alisporites-Chordasporites- Chasmatosporites组合和 Aratrisporites- Alisporites- Chasmatosporites组合以及八道湾组底部的Asseretospora- Dictyophyllidites- Cycadopites组合。前两个组合主要由常见或仅见于三叠系的属种组成 ,时代属于晚三叠世无疑 ;后一组合中前期分子大量消失 ,蕨类孢子迅速崛起 ,反映植物群出现显著变化 ,其中常见和仅见于晚三叠世的分子不复存在 ,主要成分为晚三叠世到侏罗纪常见的分子 ,具有晚三叠世到早侏罗世的过渡特点 ,时代趋向于早侏罗世。因此 ,本文提出三叠系—侏罗系的界线划在郝家沟组之顶是合适的。 相似文献
74.
75.
西藏南部江孜地区白垩系的厘定 总被引:32,自引:3,他引:29
文中对藏南江孜地区深海一次深海白垩纪地层层序、系统及厚度进行了厘定。建组剖面甲不热、维美等构造复杂,地层层序变化大,重复多。厘定后的岩石层单元有加不拉组、床得组和宗卓组。加不拉组是一套以黑色页岩为主的地层,跨不白垩统一上白垩统三冬阶,下分黑层段和白层段;床得组由紫红色页片状泥灰岩组成,各坎潘期早-中期;宗且即著名的“北家混杂堆积岩”,页岩中含大量外来岩块,时代为坎潘期晚期和马斯特里赫特期。白垩系厚 相似文献
76.
A synthesis of the petrological characters of granulite facies rocks that contain equilibrium sapphirine + quartz assemblage from two localities (Tonagh Island (TI) and Priestley Peak (PP)) in the Napier Complex,East Antarctica,provides unequivocal evidence for extreme crustal metamorphism possibly associated with the collisional orogeny during Neoarchean.The reaction microstructures associated with sapphirine + quartz vary among the samples,probably suggesting different tectonic conditions during the metamorphic evolution.Sapphirine and quartz in TI sample were probably in equilibrium at the peak stage,but now separated by corona of Grt + Sil + Opx suggesting near isobaric cooling after the peak metamorphism,whereas the Spr + Qtz + Sil + Crd + Spl assemblage replaces garnet in PP sample suggesting post-peak decompression.The application of mineral equilibrium modeling in NCKFMASHTO system demonstrated that Spr + Qtz stability is lowered down to 930 ℃ due to small Fe3+ contents in the rocks (mole Fe2O3/(FeO + Fe2O3) =0.02).The TI sample yields a peak p-T range of 950-1100 ℃ and 7.5-11 kbar,followed by cooling toward a retrograde stage of 800-950 ℃ and 8-10 kbar,possibly along a counterclockwise p-T path.In contrast,the peak condition of the PP sample shows 1000-1050 ℃ and >12 kbar,which was followed by the formation ofSpr + Qtz corona around garnet at 930-970 ℃ and 6.7-7.7 kbar,suggesting decompression possibly along a clockwise p-T trajectory.Such contrasting p-T paths are consistent with a recent model on the structural framework of the Napier Complex that correlates the two areas to different crustal blocks.The different p-T paths obtained from the two localities might reflect the difference in the tectonic framework of these rocks within a complex Neoarchean subduction/collision belt. 相似文献
77.
78.
通过对三峡巴东马鹿池断裂与官渡口断裂的成因关联对比分析,发现二者在几何学、运动学、内部结构以及年代学等方面存在很大差异。平面上,二者没有相连;规模上,马鹿池断裂晚期比早期大,发育“花状”构造,官渡口断裂晚期比早期小,其滑脱面位于早期断裂带中,大地电磁测深资料显示二者在深部没有联系;运动方式上,马鹿池断裂晚期为左行走滑,官渡口断裂晚期自南向北发生滑脱;内部分带现象上,马鹿池断裂主要存在于晚期,而官渡口断裂主要存在于早期;从断层泥特征上看,马鹿池断裂运动方式以蠕滑为主,官渡口断裂则以粘滑运动为主;地貌上,马鹿池断裂两侧地形相差不大,官渡口断裂两侧地形相差较大,南高北低,遍布溶洞;SEM、TL测年上,马鹿池断裂比官渡口断裂更新,活动距今更近。据此认为马鹿池断裂与官渡口断裂二者在成因上没有联系,在深部没有沟通。 相似文献
79.
对内蒙古东部开鲁盆地陆西凹陷地质和地球物理资料的综合研究表明,上侏罗统沉积以温湿气候条件下的粉、细砂岩及泥岩为特征,其沉积序列可以被划分成周期为3-5 Ma的5个沉积层序,各沉积层序之间均为不整合面或与之相关的整合面。沉积层序格架和构型主要受控于构造活动、气候和物源供给。各沉积层序的展布也受盆地结构和断裂差异活动的影响,表现出南厚北薄的地层展布特征。由于在马北斜坡存在地形或断裂坡折带,故可将一个沉积层序细分成低位、湖侵和高位体系域。在明确首次和最大湖泛面基本特征的基础上,重点叙述了层序B低位、湖侵和高位体系域的近岸水下扇、扇三角洲等沉积体系特征和层序构型主控因素。对有利烃源岩、储层和盖层等成藏基本条件进行分析后,指出层序C西绍根断层下降盘的近岸水下扇和位于坡折带之下的浊积扇是寻找岩性圈闭的有利地区。 相似文献
80.