Carbonates and Evaporites最新文献_第6页

Geological setting, geochemical, textural, and genesis of palygorskite in Eocene carbonate deposits from Central Tunisia 突尼斯中部始新世碳酸盐矿床中的绿帘石的地质环境、地球化学、纹理和成因

IF 1.4 4区地球科学

Carbonates and Evaporites Pub Date : 2024-03-11 DOI: 10.1007/s13146-024-00943-8

Fathi Allouche, Amina Ammous, Ali Tlili, Nejib Kallel

{"title":"Geological setting, geochemical, textural, and genesis of palygorskite in Eocene carbonate deposits from Central Tunisia","authors":"Fathi Allouche, Amina Ammous, Ali Tlili, Nejib Kallel","doi":"10.1007/s13146-024-00943-8","DOIUrl":"https://doi.org/10.1007/s13146-024-00943-8","url":null,"abstract":"The Eocene deposits belonging to the Khanguet Rheouis area, North–South Axis, Central Tunisia, consist of three lithological units deposited in a shallow water environment that is congruent to the Eocene regression. The middle unit represents a massive white dolomitic clay with gypsum intercalations that increase towards the top, containing significant amounts of palygorskite. SEM–EDX, XRD, and XRF analytical techniques were deployed to better understand the mineralogical and geochemical properties of the collected samples. Microtextural characteristics were analyzed using SEM and polarizing microscopy. Mineral spectral characteristics were determined by the Fourier Transform Infrared (FTIR) spectroscopy. The XRD analysis results show the predominance of dolomite with variable amounts of palygorskite and low quartz contents. Samples contained low concentrations of Nb, Th, Zr, Y, Rb, Zn, Cr, and V, which showed a positive correlation with the major oxides SiO2, Al2O3, Fe2O3, K2O, and TiO2, and a negative correlation with MgO and CaO, indicating that trace elements were exclusively retained in palygorskite rather than dolomite. SEM observations of palygorskite showed dense mats of short, interwoven fibers that bridged and filled the pore spaces between the dissolved dolomite. These textural characteristics suggest that the formation of palygorskite is post-dates dolomitization. Petrographic observations illustrate the existence of micro-tectonic structures such as stylolites and microcracks, playing an important role in the distribution of palygorskite. The obtained results are consistent with the hypothesis of a neoformed origin of palygorskite by direct chemical precipitation from solution, after partial dissolution of the dolomite.","PeriodicalId":9612,"journal":{"name":"Carbonates and Evaporites","volume":"284 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140100328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Soft-sediment deformation structures or microbially induced sedimentary structures: the description and possible origin of the 软沉积物变形结构或微生物诱导沉积结构：描述和可能的起源

IF 1.4 4区地球科学

Carbonates and Evaporites Pub Date : 2024-03-11 DOI: 10.1007/s13146-024-00944-7

Kai Lu, Zhidong Bao, Jin Li

{"title":"Soft-sediment deformation structures or microbially induced sedimentary structures: the description and possible origin of the","authors":"Kai Lu, Zhidong Bao, Jin Li","doi":"10.1007/s13146-024-00944-7","DOIUrl":"https://doi.org/10.1007/s13146-024-00944-7","url":null,"abstract":"Within the lower Wumishan Formation at the eastern edge of the Tai-hang Mountains in North China, a ~ 10 m stratigraphic interval contains alternately \"bright and dark\" laminites with enigmatic loop structures (2.5–27.5 cm in length and 0.6–12 cm in height), preserved in cross-sectional and named \"loopites\" in this study. The loopites are composed of cores and annulate laminations. Based on the different morphologies, they can be divided into three different types: type I, II and III. Although the loopites are similar to the loop beddings, the formation mechanisms are different. The former is possibly microbially induced sedimentary structures (MISS), while the loop beddings preserve evidence of soft-sediment deformation structures (SSDS) such as boudinage or chain structures, joints and small-scale tensional faults. All three types of loopites have cores. The type I core is made up of relicts of previous microbial mat and the microhighlands, while the type II and III loopites have cores defined by debris and rock fragments. The cores are completely wrapped by microbial mats of later generation. Thus, we can conclude that the formation of loopites is due to the growth, wrapping and deposition of microbial mats, while loop beddings are generated by external triggering mechanism such as earthquake. Furthermore, the discovery and possible formation of loopites may provide a new type of MISS and indicate a stable, anoxic and carbonate-supersaturated environment favorable for microbial mats to form annulate structures, which are controlled by illumination, microtopography and hydrodynamics.","PeriodicalId":9612,"journal":{"name":"Carbonates and Evaporites","volume":"4 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140100182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Geochemistry of Palaeoproterozoic Kajrahat Limestone, Vindhyan Supergroup, central India: insights into depositional conditions and sources of rare earth elements 印度中部 Vindhyan 超群古新生代 Kajrahat 石灰岩的地球化学：对沉积条件和稀土元素来源的见解

IF 1.4 4区地球科学

Carbonates and Evaporites Pub Date : 2024-03-09 DOI: 10.1007/s13146-024-00938-5

Akanksha Singh, B. P. Singh, S. Kanhaiya, M. A. Quasim, A. Patra, S. Singh, V. K. Srivastava

{"title":"Geochemistry of Palaeoproterozoic Kajrahat Limestone, Vindhyan Supergroup, central India: insights into depositional conditions and sources of rare earth elements","authors":"Akanksha Singh, B. P. Singh, S. Kanhaiya, M. A. Quasim, A. Patra, S. Singh, V. K. Srivastava","doi":"10.1007/s13146-024-00938-5","DOIUrl":"https://doi.org/10.1007/s13146-024-00938-5","url":null,"abstract":"The Lower Vindhyan (Semri) Group substantially consists of unmetamorphosed and undeformed sedimentary sequences of Palaeoproterozoic age. A detailed geochemical study has been carried out to infer the paleoenvironment and the source of REEs for the Palaeoproterozoic Kajrahat Limestone, Vindhyan Supergroup, Central India. This study investigates the geochemical composition of major, trace and rare earth elements (REEs). The studied limestones, have a high percentage of CaO (ranging from 30.87 to 48.59) implies that calcite was the primary mineral phase in these carbonates. SiO2 is second most abundant major oxide. Sr is dominant trace element showing a negative correlation with CaO. All trace elements exhibit depletion with respect to Post-Archean Australian Shale (PAAS). The PAAS-normalized REE pattern of studied limestone has a relatively uniform pattern, with slightly enriched LREE compared to HREE with negative Ce anomaly. Collectively, low concentration of U and U/Th, Ce/Ce* ratios clearly indicates an oxic depositional condition for the samples. The ΣREE shows a positive correlation with SiO2, TiO2 and Al2O3 (r2 = 0.87, 0.84and 0.91 respectively) and a week positive correlation with CaO (r2 = 0.12) suggested that siliciclastic sediments also serve as a source for the REEs beside seawater. This, in turn, indicates that the deposition of this limestone occurred in a coastal/shallow marine environment with some contribution from continental part.","PeriodicalId":9612,"journal":{"name":"Carbonates and Evaporites","volume":"9 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140100310","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Geochemistry of the Guadalupian—Lopingian carbonate rocks from the NE Sichuan Basin, China: implications for paleo-oceanic environment and provenance 中国四川盆地东北部瓜达卢佩-隆平带碳酸盐岩的地球化学：对古海洋环境和产地的影响

IF 1.4 4区地球科学

Carbonates and Evaporites Pub Date : 2024-03-07 DOI: 10.1007/s13146-024-00934-9

Shengyang Yao, Chuanlong Mou, Gang Zhou, Qiyu Wang, Xiuping Wang, Peng Ren, Bowen Zan

{"title":"Geochemistry of the Guadalupian—Lopingian carbonate rocks from the NE Sichuan Basin, China: implications for paleo-oceanic environment and provenance","authors":"Shengyang Yao, Chuanlong Mou, Gang Zhou, Qiyu Wang, Xiuping Wang, Peng Ren, Bowen Zan","doi":"10.1007/s13146-024-00934-9","DOIUrl":"https://doi.org/10.1007/s13146-024-00934-9","url":null,"abstract":"As the last part of the Hercynian cycle in the Yangtze region, the Dongwu Movement included the eruption of the Emeishan large igneous province (ELIP) and was an essential event between the Guadalupian and Lopingian, which had significant implications for the paleo-oceanic environment and paleoclimate of the area. To study the changes in the sedimentary environment in the Guadalupian and Lopingian, the Zhenba section was selected, and its trace elements and rare earth elements (REEs) were analyzed. From analysis of the trace elements and REEs in the Guadalupian, the limestone samples had prominent typical shallow-water seawater deposition characteristics and were less affected by terrigenous detritus, which was in an arid oxidation environment; Sr/Cu ranged from 4 to 1381, the Rb/Sr value was low, δCe < 1, Ceanom < −0.1, Er/Nd ranged from 0.1 to 0.27, and Y/Ho ranged from 44 to 72. However, in the Lopingian, the limestone samples were more affected by terrigenous detritus, which was in a humid climate with a weak oxidation‒reduction environment; the Sr/Cu ranged from 1 to 656, the Rb/Sr value was high, δCe ≅ 1, Ceanom ≥ −0.1, Er/Nd < 0.1, and Y/Ho ranged from 26 to 44. The geochemical diagrams of TiO2‒Al2O3, Al2O3‒REE, La‒Th‒Sc, Th‒Co‒Zr/10, Th‒Sc‒Zr/10 and 87Sr/86Sr of a sample indicated that the terrigenous detritus of the sample mainly came from the South Qinling active continental margin, rather than the weathering of Emeishan basalt. Acid bentonite came from the Paleo-Tethys island arc or the island arc formed by the subduction of the South China Plate beneath the North China Plate, rather than the ELIP. This evidence supported the view that the North China Plate potentially collided with the South China Plate in middle to late Wujiaping.","PeriodicalId":9612,"journal":{"name":"Carbonates and Evaporites","volume":"38 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140074596","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Identifying sub-surface Triassic salt diapirs under domal structures in the Tunisian Atlas: exploration targets for potential mineralization 确定突尼斯阿特拉斯地区穹隆构造下的三叠纪地下盐沼泽：潜在矿化的勘探目标

IF 1.4 4区地球科学

Carbonates and Evaporites Pub Date : 2024-03-06 DOI: 10.1007/s13146-024-00935-8

{"title":"Identifying sub-surface Triassic salt diapirs under domal structures in the Tunisian Atlas: exploration targets for potential mineralization","authors":"","doi":"10.1007/s13146-024-00935-8","DOIUrl":"https://doi.org/10.1007/s13146-024-00935-8","url":null,"abstract":"<h3>Abstract</h3> The aim of this study is to propose a conceptual model explaining the geometry, origin, distribution of three selected domal structures, namely Jerissa, Bou El Haneche and Bir Es Solâa and associated mineralization. These structures, located on the border of the NW–SE Kalaa Khasba graben (Tunisian Atlas), had not been extensively investigated and only inferred—but not positively identified—as salt diapirs. For this goal, a multi-disciplinary method based on satellite images, digital elevation models (DEMs), morpho-structural analysis, hydrochemistry and seismic data was used. The domal structures are clearly expressed in the DEMs, drained by radial hydrographic networks and affected by radial faulting. Under the Jerissa dome, the aquifer water samples contain high strontium values (546–598 mg/l) and also have high Sr2+/ Ca2+ ratios (between 10.59‰ and 11.22‰). This aquifer water chemical characteristics coupled to the interpretation of a seismic line crossing this structure suggest the presence of Triassic evaporitic materials in the sub-surface. The Triassic evaporitic sediments beneath the Bir Es Solâa structure were detected in the BS-1 drill hole. The results provide arguments for the existence of sub-outcropping Triassic rock which may be interpret as sub-surface diapirs under these domal structures, located preferentially at the intersection of regional NW–SE, E–W and NE–SW striking fault networks. At the three selected structures, the Aptian limestone forms the main mineralization traps for Pb–Zn–Ba and Fe. These sub-surface diapirs can be targets for mineral exploration in effort to discover potential mineralized bodies with economic concentration in central–northern Tunisian Atlas.","PeriodicalId":9612,"journal":{"name":"Carbonates and Evaporites","volume":"66 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140045195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Lithostratigraphy, petrography, and geochemistry of the Eocene–Oligocene rock succession, Wadi Arhab area, North Eastern Desert, Egypt 埃及东北部沙漠 Wadi Arhab 地区始新世-更新世岩石演替的岩层学、岩相学和地球化学

IF 1.4 4区地球科学

Carbonates and Evaporites Pub Date : 2024-03-05 DOI: 10.1007/s13146-024-00928-7

{"title":"Lithostratigraphy, petrography, and geochemistry of the Eocene–Oligocene rock succession, Wadi Arhab area, North Eastern Desert, Egypt","authors":"","doi":"10.1007/s13146-024-00928-7","DOIUrl":"https://doi.org/10.1007/s13146-024-00928-7","url":null,"abstract":"<h3>Abstract</h3> The present study recorded for the first time, an occurrence of Oligocene basaltic plugs in Beni-Suef Governorate, Egypt. In addition, Egyptian alabaster was discovered in the study area, further the well-known ancient area around the Cavern of Wadi Sannur. In this work, the lithostratigraphy, structure, petrography, and geochemistry including TGA and DSC were studied. In addition, the thermal effect of the basaltic magma on the Eocene carbonates that covered most of the area, caused the formation of the Egyptian alabaster in the region. The Eocene succession represents different stages in age (late Middle–Late Eocene). Their outcrops are disconformably overlain by the basaltic plugs extruded along the NW–SE fault trend which is parallel to the Red Sea graben which was formed in the Oligo–Miocene Period. Petrographically, the Eocene rocks show ten microfacies types indicating that deposition of Eocene carbonates in the subtidal shallow marine environment except for microfacies of the Egyptian alabaster shows that the precipitation is related to the basaltic thermal effect and related hydrothermal waters within open cavities or karstic systems in the Eocene carbonate. The chemical analysis showed that SiO2, Al2O3, MgO, Fe2O3, and CaO are of high content as major oxides, while Sr and Ba are of high content in the basaltic plugs as trace elements. TG analysis shows that basaltic rocks in the present study are suitable for conserving high-temperature thermal energy because they do not exhibit any thermal events when exposed to thermal influences by DSC between 30 °C and 1000 °C. Unlike both Egyptian alabaster and recrystallized limestone which are not suitable for maintaining high temperatures between 695 °C and 965 °C and decompose into CaO and CO2 due to the decarbonization of the calcite mineral.","PeriodicalId":9612,"journal":{"name":"Carbonates and Evaporites","volume":"12 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140036880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mineralogy, geochemistry, and stable isotope characteristics of Paleozoic carbonate-hosted vein-type barite deposits from Silifke–Mersin, Southern Türkiye 南图尔基耶 Silifke-Mersin 古生代碳酸盐岩脉型重晶石矿床的矿物学、地球化学和稳定同位素特征

IF 1.4 4区地球科学

Carbonates and Evaporites Pub Date : 2024-03-05 DOI: 10.1007/s13146-024-00924-x

Volkan Karasu, Fevzi Oner, Cihan Yalcin, Yusuf Uras, Mustafa Gurhan Yalcin

{"title":"Mineralogy, geochemistry, and stable isotope characteristics of Paleozoic carbonate-hosted vein-type barite deposits from Silifke–Mersin, Southern Türkiye","authors":"Volkan Karasu, Fevzi Oner, Cihan Yalcin, Yusuf Uras, Mustafa Gurhan Yalcin","doi":"10.1007/s13146-024-00924-x","DOIUrl":"https://doi.org/10.1007/s13146-024-00924-x","url":null,"abstract":"The Taurus Belt, one of the main tectonic belts of Türkiye, is represented by Paleozoic-aged carbonate rocks. Cilbayir and Gokbelen (Silifke/Mersin) barite deposits located in these rocks were subjected to a detailed investigation to determine their geochemistry, stable isotopic composition, mineralogy, and genetic model. The ore zone contains the veins and lenses necessary for barite, calcite, and hematite paragenesis. A barite vein strikes N35°E and dips 15°NW in the fragments of the limestone-shale sequence in the north of Gokbelen. Another ore zone has been located in the north and northwest of Cilbayir, and it is associated with limestones along a fault line striking N30°E. The veins containing barite, calcite, and hematite paragenesis have approximately the same BaO content (Cilbayir, 65.05%; Gokbelen, 64.96%). The rare earth element (REE) composition of barites is extremely poor (ƩREE is less than 10 ppm), while ƩREE in carbonate host rocks ranges between 40 and 45 ppm. The mean δ34S values of Gokbelen and Cilbayir are 36.45‰ and 41.87‰, respectively. The average imports of δ18OSMOW barites were 12.98 ‰. The Gokbelen barites have an 87Sr/86Sr ratio of 0.718796, while the Cilbayir barites have a ratio of 0.717845. Mineralization at Cilbayir is consistent with vein type with a mean SrO content of 1.2%. In contrast, samples from the Gokbelen area show characteristics of hydrothermal vein-type formations with significant SrO content (average 1.47%). The integration of mineralogical, geochemical, and stable isotope data allows for a comprehensive interpretation of the origin and evolution of the carbonate-hosted vein-type barite deposits in the Silifke–Mersin region.","PeriodicalId":9612,"journal":{"name":"Carbonates and Evaporites","volume":"87 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140036782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Discovery and primary study of the lithium content in the karst-type bauxite deposit, Jajarm, Iran 伊朗贾贾尔姆岩溶型铝土矿锂含量的发现和初步研究

IF 1.4 4区地球科学

Carbonates and Evaporites Pub Date : 2024-03-04 DOI: 10.1007/s13146-024-00941-w

Masoumeh Nikdel, Majid Ghoraee Tafti, Morteza Nikdel

{"title":"Discovery and primary study of the lithium content in the karst-type bauxite deposit, Jajarm, Iran","authors":"Masoumeh Nikdel, Majid Ghoraee Tafti, Morteza Nikdel","doi":"10.1007/s13146-024-00941-w","DOIUrl":"https://doi.org/10.1007/s13146-024-00941-w","url":null,"abstract":"Lithium (Li) is a critical metal for global development and modern energy. Emerging sediment hosts, which contain karst-type bauxite deposits, afford a potential source of Li resources. Iran has no history in occurrence of bauxite-hosted Li deposits and no investigations have done. Therefore, that leads to the importance of further research and exploration on these deposits. In this investigation, the samples of Jajarm bauxite were analyzed by combination of X-ray diffraction (XRD), petrographic and scanning electron microscopy–energy-dispersive spectroscopy (SEM–EDS), inductively coupled plasma mass spectrometry (ICP-MS), and X-ray fluorescence (XRF) techniques, with the aims to investigate the distribution and enrichment of the Li. The results show that Li concentrations in Jajarm bauxite deposit range from 91 to 1192 ppm. The maximum Li concentrations occur in shaly bauxite samples. Oolitic bauxite mainly consists of diaspore and chamosite, with small amounts of anatase and boehmite. Shaly bauxite dominantly consists of kaolinite, diaspore with small amounts of mica, quartz, and anatase, and kaolinitic bauxite predominantly consists of kaolinite. Kaolinite, diaspore, anatase, and mica minerals were identified by SEM–EDS analysis. Independent Li minerals were not found in mineralogical analysis. The correlation coefficient of Li with other mineralogical and geochemical parameters shows that kaolinite and mica are the most likely host minerals of Li in the studied bauxites. Therefore, Jajarm bauxite deposit, located in northeastern Iran, serves as a bauxite resource and an independent Li resource, making it valuable for development and utilization.","PeriodicalId":9612,"journal":{"name":"Carbonates and Evaporites","volume":"6 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140026014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A detailed investigation of Jutana Formation for depositional setting in Indus Basin, Pakistan 巴基斯坦印度河盆地朱塔纳地层沉积环境详细调查

IF 1.4 4区地球科学

Carbonates and Evaporites Pub Date : 2024-03-04 DOI: 10.1007/s13146-024-00951-8

Muhammad Ibrar, Hameed Ur Rehman, Suleman Khan, Syed Saddam Hussain, Maqsood Ur Rahman, Abdullah Khan

{"title":"A detailed investigation of Jutana Formation for depositional setting in Indus Basin, Pakistan","authors":"Muhammad Ibrar, Hameed Ur Rehman, Suleman Khan, Syed Saddam Hussain, Maqsood Ur Rahman, Abdullah Khan","doi":"10.1007/s13146-024-00951-8","DOIUrl":"https://doi.org/10.1007/s13146-024-00951-8","url":null,"abstract":"The origin and depositional setting of dolomites remain a complex and debated topic. In the Indus Basin Pakistan, the dolomites in Jutana Formation form a thick sequence within the Cambrian stratigraphy. The current study investigates the detailed depositional setting as well as the mineralogical composition of dolomites in the Jutana Formation to provide insight into their origin. The study focuses on integrating the microfacies and Scanning Electron Microscopy (SEM) with X-ray diffraction (XRD) data along with Wireline logs of Jutana Formation in Khewra Gorge, Eastern Salt Range. Based on field and petrographic observations, four microfacies were identified including (a) siliciclastic algal laminated dolomitic breccia (MJD-1), (b) burrowed sandy ferroan dolomicrite (MJD-2), (c) in-situ medium-coarse grained dolomicrite-dolosparite (MJD-3), (d) fine grained micaceous dolosparite (MJD-4). The microfacies analysis reveals that the deposition of the Jutana Formation is primary on carbonate platform in peritidal environments, ranging from supratidal to subtidal. Digenesis has obliterated most of the primary depositional features, making the interpretation of the original depositional setting challenging. The XRD analysis suggests that these dolomites are nearly stoichiometric and less ordered, indicating an early diagenetic setting, further supported by the presence of anhydrite seen under the SEM. The original depositional setting on the carbonate platform is also supported by cross plot graph wireline logs.","PeriodicalId":9612,"journal":{"name":"Carbonates and Evaporites","volume":"7 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140026425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pollen and grain size characteristics recorded from evaporite in the Kumishi Basin in arid Central Asia: implications for climate and environmental change since the late glacial 中亚干旱地区库米希盆地蒸发岩记录的花粉和粒度特征：对晚冰期以来气候和环境变化的影响

IF 1.4 4区地球科学

Carbonates and Evaporites Pub Date : 2024-03-02 DOI: 10.1007/s13146-024-00952-7

Tiantao Yin, Mingzhang Peng, Yujing Yin, Chao Zhang, Fengan Yin, Congcong Zhao

{"title":"Pollen and grain size characteristics recorded from evaporite in the Kumishi Basin in arid Central Asia: implications for climate and environmental change since the late glacial","authors":"Tiantao Yin, Mingzhang Peng, Yujing Yin, Chao Zhang, Fengan Yin, Congcong Zhao","doi":"10.1007/s13146-024-00952-7","DOIUrl":"https://doi.org/10.1007/s13146-024-00952-7","url":null,"abstract":"Climatic and environmental changes in the arid region of Central Asia since the late glacial period have long been a research focus. This study investigated the 200 cm evaporite profile in the Kumishi Basin, an inland Salt Lake situated in the arid region of Central Asia. By utilising AMS14C dating and examining the relationship between pollen and grain size, this study analysed the paleoclimate and related paleoenvironmental changes. Based on the dating results and the characteristics of pollen and grain size, it was deduced that the Kumishi Salt Lake formed prior to 11.6 cal ka BP. Although the climate was initially humid, the dominant conditions in this area were mainly arid, featuring desert and desert vegetation environments. Between 11.6 and 6.0 cal ka BP, the vegetation primarily consisted of desert steppe, while the climate remained predominantly dry with a minor period of humidity in the early stages of the Holocene. From 6.0 to 0 cal ka BP, desert grasslands continued to dominate the landscape as the climate gradually intensified in aridity. These climate fluctuations in the Kumishi Salt Lake area exhibited distinct regional characteristics after the late glacial period. Compared to the monsoon system, the climate of the study area was more likely influenced and controlled by the westerlies, as particularly evidenced by the dry environment during the Holocene period.","PeriodicalId":9612,"journal":{"name":"Carbonates and Evaporites","volume":"70 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2024-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140019808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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