Geologica Carpathica最新文献_第9页

Decompressional equilibration of the Midsund granulite from Otrøy, Western Gneiss Region, Norway 挪威西部Gneiss地区Otrøy的Midsund麻粒岩的减压平衡

IF 1.3 4区地球科学

Geologica Carpathica Pub Date : 2019-12-01 DOI: 10.2478/geoca-2019-0027

Johanna Holmberg, M. Bukała, P. Jeanneret, I. Klonowska, J. Majka

{"title":"Decompressional equilibration of the Midsund granulite from Otrøy, Western Gneiss Region, Norway","authors":"Johanna Holmberg, M. Bukała, P. Jeanneret, I. Klonowska, J. Majka","doi":"10.2478/geoca-2019-0027","DOIUrl":"https://doi.org/10.2478/geoca-2019-0027","url":null,"abstract":"Abstract The Western Gneiss Region (WGR) of the Scandinavian Caledonides is an archetypal terrain for high-pressure (HP) and ultrahigh-pressure (UHP) metamorphism. However, the vast majority of lithologies occurring there bear no, or only limited, evidence for HP or UHP metamorphism. The studied Midsund HP granulite occurs on the island of Otrøy, a locality known for the occurrence of the UHP eclogites and mantle-derived, garnet-bearing ultramafics. The Midsund granulite consists of plagioclase, garnet, clinopyroxene, relict phengitic mica, biotite, rutile, quartz, amphibole, ilmenite and titanite, among the most prominent phases. Applied thermodynamic modelling in the NCKFMMnASHT system resulted in a pressure–temperature (P–T) pseudosection that provides an intersection of compositional isopleths of XMg (Mg/Mg+Fe) in garnet, albite in plagioclase and XNa (Na/Na+Ca) in clinopyroxene in the stability field of melt + plagioclase + garnet + clinopyroxene + amphibole + ilmenite. The obtained thermodynamic model yields P–T conditions of 1.32–1.45 GPa and 875–970 °C. The relatively high P–T recorded by the Midsund granulite may be explained as an effect of equilibration due to exhumation from HP (presumably UHP) conditions followed by a period of stagnation under HT at lower-to-medium crustal level. The latter seems to be a more widespread phenomenon in the WGR than previously thought and may well explain commonly calculated pressure contrasts between neighboring lithologies in the WGR and other HP–UHP terranes worldwide.","PeriodicalId":12545,"journal":{"name":"Geologica Carpathica","volume":"70 1","pages":"471 - 482"},"PeriodicalIF":1.3,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44400308","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: 2

Exhumation history of the Variscan suture: Constrains on the detrital zircon geochronology from Carboniferous–Permian sandstones (Northern Gemericum; Western Carpathians) Variscan缝合带的发掘历史:石炭-二叠系砂岩碎屑锆石年代学的约束西方喀尔巴阡山)

IF 1.3 4区地球科学

Geologica Carpathica Pub Date : 2019-12-01 DOI: 10.2478/geoca-2019-0030

A. Vozárová, Katarína Šarinová, Dušan Laurinc, E. Lepekhina, J. Vozár, N. Rodionov, P. Lvov

{"title":"Exhumation history of the Variscan suture: Constrains on the detrital zircon geochronology from Carboniferous–Permian sandstones (Northern Gemericum; Western Carpathians)","authors":"A. Vozárová, Katarína Šarinová, Dušan Laurinc, E. Lepekhina, J. Vozár, N. Rodionov, P. Lvov","doi":"10.2478/geoca-2019-0030","DOIUrl":"https://doi.org/10.2478/geoca-2019-0030","url":null,"abstract":"Abstract The Late Paleozoic sedimentary basins in the Northern Gemericum evolved gradually in time and space within the collisional tectonic regime of the Western Carpathian Variscan orogenic belt. The detrital zircon age spectra, obtained from the Mississippian, Pennsylvanian and Permian metasediments, have distinctive age distribution patterns that reflect the tectonic setting of the host sediments. An expressive unimodal zircon distribution, with an age peak at 352 Ma, is shown by the basal Mississippian metasediments. These represent a relic of the convergent trench-slope sedimentary basin fill. In comparison, the Pennsylvanian detrital zircon populations display distinct multimodal distributions, with the main age peaks at 351, 450, 565 Ma and smaller peaks at ~2.0 and ~2.7 Ga. This is consistent with derivation of clastic detritus from the collisional suture into the foreland basin. Similarly, the Permian sedimentary formations exhibit the multimodal distribution of zircon ages, with main peaks at 300, 355 and 475 Ma. The main difference, in comparison with the Pennsylvanian detrital zircon assemblages, is the sporadic occurrence of the Kasimovian– Asselian (306–294 Ma), as well as the Artinskian–Kungurian (280–276 Ma) igneous zircons. The youngest magmatic zircon ages nearly correspond to the syn-sedimentary volcanic activity with the depositional age of the Permian host sediments and clearly indicate the extensional, rift-related setting.","PeriodicalId":12545,"journal":{"name":"Geologica Carpathica","volume":"70 1","pages":"512 - 530"},"PeriodicalIF":1.3,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69208238","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: 5

Mineralogical and physico–chemical properties of bentonites from the Jastrabá Formation (Kremnické vrchy Mts., Western Carpathians) 喀尔巴阡山脉西部kremnick<s:1> vrchy mt . jastrab<e:1>组膨润土的矿物学和理化性质

IF 1.3 4区地球科学

Geologica Carpathica Pub Date : 2019-10-01 DOI: 10.2478/geoca-2019-0025

M. Osacký, Tomáš Binčík, Tomáš Paľo, P. Uhlík, J. Madejová, A. Czímerová

{"title":"Mineralogical and physico–chemical properties of bentonites from the Jastrabá Formation (Kremnické vrchy Mts., Western Carpathians)","authors":"M. Osacký, Tomáš Binčík, Tomáš Paľo, P. Uhlík, J. Madejová, A. Czímerová","doi":"10.2478/geoca-2019-0025","DOIUrl":"https://doi.org/10.2478/geoca-2019-0025","url":null,"abstract":"Abstract In the past years an increasing demand for bentonites resulted in the opening of new bentonite deposits in the Jastrabá Formation. The shortage of information, in particular analytical data, on the bentonites from the newly opened Jastrabá Fm. deposits was the motivation for the current study. Smectite is the predominant mineral in all bulk bentonites from the new deposits. Its amount varied between 43 and 90 wt. %. The bulk bentonites also contain variable amounts (10–57 wt. %) of mineral admixtures such as feldspars, mica, opal-CT, kaolinite, quartz and sometimes goethite. The smectite mineral comprising the studied bentonites was montmorillonite. The octahedral Al in the structure of montmorillonite was partially substituted by Mg, and to a lesser extent by Fe. The interlayer space of montmorillonite is occupied predominantly by divalent exchangeable cations (Ca2+ and Mg2+). The dehydroxylation temperature of smectites (>600 °C) determined on the DTG curves indicates the presence of the cis-vacant variety of montmorillonites. The mean crystallite thicknesses of smectites (TMEAN) calculated by BWA analyses ranges from 7.2 to 11.5 nm. The shape of the crystallite thickness distributions (CTDs) for smectites is lognormal in all cases. Cation exchange capacity (CEC) and total specific surface area (TSSA) increases with increasing amount of smectite. The CEC of 101 meq/100g and TSSA of 616 m2/g correspond to bulk bentonite from the Stará Kremnička III deposit containing 89 wt. % of smectite.","PeriodicalId":12545,"journal":{"name":"Geologica Carpathica","volume":"70 1","pages":"433 - 445"},"PeriodicalIF":1.3,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44168496","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: 7

New 40Ar/39Ar, fission track and sedimentological data on a middle Miocene tuff occurring in the Vienna Basin: Implications for the north-western Central Paratethys region 维也纳盆地中新世凝灰岩的新40Ar/39Ar、裂变轨道和沉积学数据：对中副特提斯地区西北部的启示

IF 1.3 4区地球科学

Geologica Carpathica Pub Date : 2019-10-01 DOI: 10.2478/geoca-2019-0022

S. Rybár, Katarína Šarinová, K. Sant, K. Kuiper, M. Kováčová, R. Vojtko, M. Reiser, K. Fordinál, V. Teodoridis, Petronela Nováková, T. Vlček

引用次数: 21

Deep gravity data interpretation using seismic reflection and well data: A case study of the West Gharib-Bakr area, Eastern Desert, Egypt 利用地震反射和井资料进行深部重力数据解释:以埃及东部沙漠West Gharib-Bakr地区为例

IF 1.3 4区地球科学

Geologica Carpathica Pub Date : 2019-10-01 DOI: 10.2478/geoca-2019-0021

A. Azab

{"title":"Deep gravity data interpretation using seismic reflection and well data: A case study of the West Gharib-Bakr area, Eastern Desert, Egypt","authors":"A. Azab","doi":"10.2478/geoca-2019-0021","DOIUrl":"https://doi.org/10.2478/geoca-2019-0021","url":null,"abstract":"Abstract A rigorous processing and analysis of the gravity data with seismic reflection and borehole information enabled a general view of the deep-seated regional structures in the West Gharib-Bakr area, Eastern Desert, Egypt. In this context, several interpretational techniques were applied to learn more about the supra-basement structures and intra-basement sources. The interpretation started with a review of the seismic data to clarify the structural elements on top of the Miocene strata, where a number of isochronous reflection maps were constructed and had migrated into depth maps. The Bouguer anomaly map was processed using Fast Fourier Transform filtering based on spectral analysis to separate the gravity anomalies into its components. Gravity stripping was also performed under the seismic isopachs and density controls. The gravity effect of each rock unit was calculated and progressively removed from the original data to obtain a new gravity map on top of the Pre-Miocene. To ensure more reliable results, further filtering and analytical processes were applied to the stripped map. The results of seismic analysis show simple structural configurations at the Miocene level, with a significant increase of evaporite thickness along the Gulf of Suez coast. In contrast, analysis of the stripped gravity map reveals a more intricate structure at the Pre-Miocene level, with increasing numbers/lengths of faults on the basement surface. Lineament analysis shows two major peaks trending N0–20°W and N50–70°E, produced by two main forces in NNW–SSE (compression) and ENE–WSW (tension) directions. The models confirmed a rough and ruptured basement surface, with no evidence of any magmatic intrusions penetrating the sediments. The basement relief map delineates five basins/sub-basins in the area which are separated from each other by ridges/saddles.","PeriodicalId":12545,"journal":{"name":"Geologica Carpathica","volume":"70 1","pages":"373 - 385"},"PeriodicalIF":1.3,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46659626","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: 1

Recycling of Paleoproterozoic and Neoproterozoic crust recorded in Lower Paleozoic metasandstones of the Northern Gemericum (Western Carpathians, Slovakia): Evidence from detrital zircons 北杰默里克（斯洛伐克喀尔巴阡山脉西部）下古生代变质砂岩中记录的古元古代和新元古代地壳的再循环：来自碎屑锆石的证据

IF 1.3 4区地球科学

Geologica Carpathica Pub Date : 2019-08-01 DOI: 10.2478/geoca-2019-0017

A. Vozárová, N. Rodionov, Katarína Šarinová

{"title":"Recycling of Paleoproterozoic and Neoproterozoic crust recorded in Lower Paleozoic metasandstones of the Northern Gemericum (Western Carpathians, Slovakia): Evidence from detrital zircons","authors":"A. Vozárová, N. Rodionov, Katarína Šarinová","doi":"10.2478/geoca-2019-0017","DOIUrl":"https://doi.org/10.2478/geoca-2019-0017","url":null,"abstract":"Abstract U–Pb (SHRIMP) detrital zircon ages from the Early Paleozoic meta-sedimentary rocks of the Northern Gemericum Unit (the Smrečinka Formation) were used to characterize their provenance. The aim was to compare and reconcile new analyses with previously published data. The detrital zircon age spectrum demonstrates two prominent populations, the first, Late Neoproterozoic (545–640 Ma) and the second, Paleoproterozoic (1.8–2.1 Ga), with a minor Archean population (2.5–3.4 Ga). The documented zircon ages reflect derivation of the studied metasedimentary rocks from the Cadomian arc, which was located along the West African Craton. The acquired data supports close relations of the Northern Gemericum basement with the Armorican terranes during Neoproterozoic and Ordovician times and also a close palinspastic relation with the other crystalline basements of the Central Western Carpathians. In comparison, the detrital zircons from the Southern Gemericum basement and its Permian envelope indicate derivation from the Pan-African Belt–Saharan Metacraton provenance.","PeriodicalId":12545,"journal":{"name":"Geologica Carpathica","volume":"70 1","pages":"298 - 310"},"PeriodicalIF":1.3,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44412627","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: 7

Turbidite sedimentology, biostratigraphy and paleoecology: A case study from the Oligocene Zuberec Fm. (Liptov Basin, Central Western Carpathians) 浊积岩沉积学、生物地层学与古生态学——以渐新统祖别列克组为例。(喀尔巴阡山脉中西部利普托夫盆地)

IF 1.3 4区地球科学

Geologica Carpathica Pub Date : 2019-08-01 DOI: 10.2478/geoca-2019-0016

D. Starek, V. Šimo, Silvia Antolíková, Tomáš Fuksi

引用次数: 4

Integrated bio- and cyclostratigraphy of Middle Triassic (Anisian) ramp deposits, NW Bulgaria 保加利亚西北部中三叠纪（阿尼斯阶）斜坡矿床的综合生物和旋回地层学

IF 1.3 4区地球科学

Geologica Carpathica Pub Date : 2019-08-01 DOI: 10.2478/geoca-2019-0019

G. Ajdanlijsky, A. Strasser, A. Götz

{"title":"Integrated bio- and cyclostratigraphy of Middle Triassic (Anisian) ramp deposits, NW Bulgaria","authors":"G. Ajdanlijsky, A. Strasser, A. Götz","doi":"10.2478/geoca-2019-0019","DOIUrl":"https://doi.org/10.2478/geoca-2019-0019","url":null,"abstract":"Abstract A cyclostratigraphic interpretation of peritidal to shallow-marine ramp deposits of the early Middle Triassic (Anisian) Opletnya Member exposed in outcrops along the Iskar River gorge, NW Bulgaria, is presented. Based on facies trends and bounding surfaces, depositional sequences of several orders can be identified. New biostratigraphic data provide a time frame of the studied succession with placement of the boundaries of the Anisian substages and show that the Aegean (early Anisian) substage lasted about 1.6 Myr. In the corresponding interval in the two studied sections, 80 elementary sequences are counted. Five elementary sequences compose a small-scale sequence. The prominent cyclic pattern of the Opletnya Member can thus be interpreted in terms of Milankovitch cyclicity: elementary sequences represent the precession (20-kyr) cycle and small-scale sequences the short eccentricity (100-kyr) cycle in the Milankovitch frequency band. Medium-scale sequences are defined based on lithology but only in two cases can be attributed to the long eccentricity cycle of 405 kyr. The transgressive-regressive facies trends within the sequences of all scales imply that they were controlled by sea-level changes, and that these were in tune with the climate changes induced by the orbital cycles. However, the complexity of facies and sedimentary structures seen in the Opletnya Member also implies that additional factors such as lateral migration of sediment bodies across the ramp were active. In addition, three major sequence boundaries have been identified in the studied sections, which can be correlated with the boundaries Ol4, An1, and An2 of the Tethyan realm.","PeriodicalId":12545,"journal":{"name":"Geologica Carpathica","volume":"70 1","pages":"325 - 354"},"PeriodicalIF":1.3,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47097446","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: 4

The calcareous nannofossils and magnetostratigraphic results from the Upper Tithonian–Berriasian of Feodosiya region (Eastern Crimea) Feodosiya地区（克里米亚东部）上提香阶-Berriasian的钙质超微化石和磁性地层学结果

IF 1.3 4区地球科学

Geologica Carpathica Pub Date : 2019-08-01 DOI: 10.2478/geoca-2019-0020

V. Arkadiev, Marina Lescano, A. Concheyro, A. Guzhikov, E. Baraboshkin

引用次数: 3

Oligocene turbidite fans of the Dukla Basin: New age data from the calcareous nannofossils and paleoenvironmental conditions (Cergowa beds, Polish–Slovakian borderland) Dukla盆地渐新世浊积扇:来自钙质纳米化石的新时代数据和古环境条件(波兰-斯洛伐克边境Cergowa地层)

IF 1.3 4区地球科学

Geologica Carpathica Pub Date : 2019-08-01 DOI: 10.2478/geoca-2019-0018

J. Pszonka, Katarína Žecová, M. Wendorff

{"title":"Oligocene turbidite fans of the Dukla Basin: New age data from the calcareous nannofossils and paleoenvironmental conditions (Cergowa beds, Polish–Slovakian borderland)","authors":"J. Pszonka, Katarína Žecová, M. Wendorff","doi":"10.2478/geoca-2019-0018","DOIUrl":"https://doi.org/10.2478/geoca-2019-0018","url":null,"abstract":"Abstract Calcareous nannofossils found in the Cergowa beds of the Dukla and Fore-Dukla tectonic units in the Outer Carpathians indicate a time of deposition in the range of the NP23–NP24 nannoplankton zones of the Lower Oligocene. Nannoplankton assemblages reflect the paleoecological changes at the Eocene–Oligocene transition from: (i) a greenhouse to an icehouse climate; (ii) brackish to normal salinity suggesting open sea conditions, which were controlled by the Paratethys Basin closure followed by opening and connection with the Tethyan Ocean. The absence of nannofossils of NP25 zone, but their presence in the tectonic windows between 40 and 80 km to the west, shows that deposition of the Cergowa beds in the western part of the basin lasted longer than in the east. Occurrences of nannofossils indicating zones NP16 and NP21, found in the uppermost mudstone-rich parts of studied sections, may prove the remobilization and redeposition of sediments of this stratigraphic age. Potentially, eroded material could be derived from some of the following lithostratigraphic units: NP16 — the Hieroglyphic beds, Przybyszów sandstones and Upper variegated shales; NP21 — the Globigerina marls, Mszanka sandstones and sub-Chert marls and shales and/or fine-grained equivalent of these units. Reworked specimens derived from the older Mesozoic strata occur occasionally in various samples.","PeriodicalId":12545,"journal":{"name":"Geologica Carpathica","volume":"70 1","pages":"311 - 324"},"PeriodicalIF":1.3,"publicationDate":"2019-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46801048","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: 3