scholarly journals Tracking the Origin and Evolution of Diagenetic Fluids of Upper Jurassic Carbonate Rocks in the Zagros Thrust Fold Belt, NE-Iraq

Water ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3284
Author(s):  
Namam Salih ◽  
Alain Préat ◽  
Axel Gerdes ◽  
Kurt Konhauser ◽  
Jean-Noël Proust
Keyword(s):  
Carbonate Rocks ◽  
Meteoric Water ◽  
Upper Jurassic ◽  
Strontium Isotope ◽  
Fold Belt ◽  
Origin And Evolution ◽  
Lack Of Information ◽  
Initial Stage ◽  
Diagenetic Fluids ◽  
Late Diagenesis

Utilizing sophisticated tools in carbonate rocks is crucial to interpretating the origin and evolution of diagenetic fluids from the Upper Jurassic carbonate rocks along the Zagros thrust-fold Belt. The origin and evolution of the paleofluids utilizing in-situ strontium isotope ratios by high resolution laser ablation ICP-MS, integrated with stable isotopes, petrography and fieldwork are constrained. Due to the lack of information on the origin of the chemistry of the fluids, the cements that filled the Jurassic carbonate rocks were analysed from the fractures and pores. This allowed us to trace the origin of fluids along a diagenetic sequence, which is defined at the beginning from the sediment deposition (pristine facies). Based on petrography and geochemistry (oxygen-, carbon- and strontium-isotope compositions) two major diagenetic stages involving the fluids were identified. The initial stage, characterized by negative δ13CVPDB values (reaching −10.67‰), involved evaporated seawater deposited with the sediments, mixed with the input of freshwater. The second stage involved a mixture of meteoric water and hot fluids that precipitated as late diagenetic cements. The late diagenetic cements have higher depleted O–C isotope compositions compared to seawater. The diagenetic cements display a positive covariance and were associated with extra- δ13CVPDB and δ18OVPDB values (−12.87‰ to −0.82‰ for δ18OVPDB and −11.66‰ to −1.40‰ for δ13CVPDB respectively). The distinction between seawater and the secondary fluids is also evident in the 87Sr/86Sr of the host limestone versus cements. The limestones have 87Sr/86Sr up to 0.72859, indicative of riverine input, while the cements have 87Sr/86Sr of (0.70772), indicative of hot fluid circulation interacting with meteoric water during late diagenesis.

THE CRIMINALISTIC CHARACTERISTIC OF THEFT IN CONSTRUCTION SECTOR

2020 ◽  
pp. 37-42
Author(s):  
Владимир Дмитриевич Зеленский ◽  
Александр Константинович Безбогин
Keyword(s):  
Correct Choice ◽  
Construction Sector ◽  
Qualitative Investigation ◽  
Systematic Description ◽  
Lack Of Information ◽  
Initial Stage ◽  
Construction Knowledge

Криминалистическая характеристика хищений в сфере строительства представляет собой систематизированное описание криминалистически значимых признаков данной группы преступлений (хищения, совершенного путем мошенничества, а также хищения, совершенного путем присвоения или растраты). Криминалистическая характеристика хищения в строительстве должна состоять из криминалистически значимых элементов, описывающих данную группу преступлений и позволяющих следователю, опираясь на нее, осуществить качественное расследование. Знание следователем содержания криминалистической характеристики конкретного вида или группы преступлений и ее практическое использование позволяют ему в условиях дефицита информации на первоначальном этапе расследования минимизировать риск принятия неверных решений и совершения ошибочных действий. Элементами криминалистической характеристики хищений в строительной сфере являются: 1) сведения о способе хищения в строительстве (включающие в себя сведения о способах подготовки, совершения и сокрытия преступления); 2) сведения о характерных типичных следах (материальных и идеальных) совершенного или совершаемого хищения в строительстве. Знание содержания именно этих элементов следователем на первоначальном этапе расследования хищений в строительной сфере обеспечат верный выбор направления расследования и оперативное проведение следственных действий по обнаружению и изъятию доказательств, сведя к минимуму их возможную утрату. Criminalistic characteristics of theft in the construction sector is a systematic description of criminally significant features of this group of crimes (theft committed by fraud, as well as theft committed by appropriation or embezzlement). Criminalistic characteristics of theft in construction sector should consist of criminally significant elements that describe this group of crimes and allow the investigator, based on it, to carry out a qualitative investigation. The investigator's knowledge of the content of the forensic characteristics of a particular type or group of crimes and its practical use allow him to minimize the risk of making incorrect decisions and committing erroneous actions in the context of a lack of information at the initial stage of the investigation. The elements of criminalistic characteristics of theft in the construction sector are: 1) information about the method of theft in construction (including information about the methods of preparation, Commission and concealment of the crime); 2) information about the characteristic typical traces (material and ideal) of theft committed or committed in construction. Knowledge of the content of these elements by the investigator at the initial stage of the investigation of theft in the construction sector will ensure the correct choice of the direction of investigation and prompt conduct of investigative actions to detect and remove evidence, minimizing their possible loss.

The pattern of the tectonic joints and the development of the Vlychada karst show cave in Diros, Peloponnesus, Greece

2021 ◽  
Author(s):  
Christos Filis ◽  
Emmanuel Skourtsos ◽  
Nikolaos Karalemas ◽  
Vasilios Giannopoulos ◽  
Ioannis Giannopoulos ◽  
...  
Keyword(s):  
Characteristic Feature ◽  
Sea Level ◽  
Carbonate Rocks ◽  
Meteoric Water ◽  
Weather Conditions ◽  
High Angle ◽  
Tectonic Structures ◽  
Joint System ◽  
Factors Influencing ◽  
Show Cave

<p>The most characteristic feature of carbonate rocks is that they are prone to dissolution due to the meteoric water circulation which is enriched in CO<sub>2</sub>. One of the factors influencing this phenomenon is the existence of discontinuities within the mass of carbonate rocks. The Diros Vlychada show cave, on the peninsula of Mani in Peloponnese, Greece, has developed in marbles that belong to the Plattenkalk geotectonic unit. Most of the cave is flooded with water and its level changes depending on the external weather conditions and variations in sea level. The deformation of the marbles is represented by tectonic structures formed during the Lower Miocene metamorphism and their subsequent exhumation. The final uplift stage took place during the Pliocene-Quaternary and is still active. Five joints systems were distinguished:</p><p>A NW-SE joint system which is subdivided into a subsystem with low-angle dips, mainly towards to the NW, related to the main foliation of the marbles and a second subsystem characterized by stretching joints of the same strike (elongated joints), which have high-angle dips, also towards the NW. The latter system intersects the former but is confined between marble bedding and does not extend to more than three beds (the bedding is defined by the first subsystem).</p><p>A NW-SE striking joint system characterized by stretching joints with high-angle dips, which intersects diagonally the two previous. This system extends between more than three marble beds.</p><p>Two systems show E-W and N-S strike with the first one much better expressed. Those joints have developed diagonally to the previous ones. These are mainly shear joints that intersect the first system and are propagated within many marble beds.</p><p>The chambers of the cave have been developed along NW-SE and E-W directions. The first one is identified with the joint system that has been developed transversely to the strike of the marble foliation and the second in parallel with the main system of the shear joints. It is interesting that the bays forming the coastline of the Mani peninsula, have developed in an E-W direction, which coincides with both one of the growth directions of the cave and one of the joints systems, which correspond to shear joints developed during the folding of the marbles. Stalactites and stalagmites grow in a NE-SW direction that is identical to the elongated joints which form the system that is parallel to the foliation strike. Groundwater flow along these branches may be slower as these branches appear to be restricted between marble bedding.</p>

scholarly journals Structural style and kinematics of the Taihang-Luliangshan fold belt, North China: Implications for the Yanshanian orogeny

Lithosphere ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 767-783 ◽  
Author(s):  
Christopher Clinkscales ◽  
Paul Kapp
Keyword(s):  
North China ◽  
Ordos Basin ◽  
Structural Data ◽  
Upper Jurassic ◽  
Geological Mapping ◽  
Fold Belt ◽  
Lower Paleozoic ◽  
The North ◽  
Structural Style ◽  
Fold Belts

Abstract The Middle–Late Jurassic to earliest Cretaceous fold belts of the Yanshanian orogen in North China remain enigmatic with respect to their coeval deformation histories and possible relationship to the contemporaneous Cordilleran-style margin of eastern Asia. We present geological mapping, structural data, and a >400-km-long, strike-perpendicular balanced cross section for the Taihang-Luliangshan fold belt exposed in the late Cenozoic central Shanxi Rift. The northeast-southwest–trending Taihang-Luliangshan fold belt consists of long-wavelength folds (∼35–110 km) with ∼1–9 km of structural relief cored by Archean and Paleoproterozoic metamorphic and igneous basement rocks. The fold belt accommodated ≥11 km of northwest-southeast shortening between the Taihangshan fault, bounding the North China Plain, in the east and the Ordos Basin in the west. Geological mapping in the Xizhoushan, a northeast-southwest–oriented range within the larger Taihangshan mountain belt, reveals two major basement-cored folds: (1) the Xizhou syncline, with an axial trace that extends for ∼100 km and is characterized by a steep to overturned forelimb consistent with a southeast sense of vergence, and (2) the Hutuo River anticline, which exposes Archean–Paleoproterozoic rocks in its core that are unconformably overlain by shallowly dipping (<∼20°) Lower Paleozoic rocks. In the Luliangshan, Mesozoic structures include the Luliang anticline, the largest recognized anticline in the region, the Ningjing syncline, which preserves a complete section of Paleozoic to Upper Jurassic strata, and the Wuzhai anticline; together, these folds are characterized by a wavelength of ∼45–50 km. Shortening in the Taihang-Luliangshan fold belt is estimated to have occurred between ca. 160 Ma and 135 Ma, based on the age of the youngest deformed Upper Jurassic rocks in the Ningjing syncline, previously published low-temperature thermochronology, and regional correlations to better-studied Yanshanian fold belts. The timing of basement-involved deformation in the Taihang-Luliangshan fold belt, which formed >1000 km from the nearest plate margin, corresponds with the termination of arc magmatism along the eastern margin of Asia, implying a potential linkage to the kinematics of the westward-subducting Izanagi (paleo-Pacific) plate.

Origin and evolution of an Upper Jurassic complex of carbonate buildups from Zegarowe Rocks (Kraków–Wieluń Upland, Poland)

Facies ◽  
2006 ◽  
Vol 52 (2) ◽  
pp. 249-263 ◽  
Author(s):  
Jacek Matyszkiewicz ◽  
Marcin Krajewski ◽  
Jarosław Kędzierski
Keyword(s):  
Upper Jurassic ◽  
Origin And Evolution ◽  
Carbonate Buildups

Hydrocarbon Geology Characteristics and Oil & Gas Resource Potential in the Afghan-Tajik Basin

2013 ◽  
Vol 734-737 ◽  
pp. 366-372
Author(s):  
Wei Yin
Keyword(s):  
Carbonate Rocks ◽  
Sedimentary Environment ◽  
Upper Jurassic ◽  
Source Rocks ◽  
Resource Potential ◽  
Mountain Ranges ◽  
Clastic Rocks ◽  
Reef Limestone ◽  
Jurassic System ◽  
Oil Gas

The Afghan-Tajik Basin is an intermontane depression between the mountain ranges of Gissar and Pamirs, and Jurassic system and Tertiary system are rich in large oil & gas resources. In order to assure sustainable supply of oil & gas from Central Asia, we deeply researched hydrocarbon geology characteristics and resource potentials. The basin belongs to paralic sedimentary environment, and develops 3 sedimentary strata: Jurassic, Cretaceous, and Tertiary. Afghan-Tajik Basin develops 3 main source rocks including clastic rocks of Jurassic, carbonate rocks of Cretaceous and mudstone rocks of Eocene. The basin develops 2 plays: Jurassic-Cretaceous play is gas containing one, and Tertiary play is oil containing one. Plaster stone and salt rock of upper Jurassic are regional cap rocks of Jurassic-Cretaceous gas pool, and creaming mudstone and muddy limestone of Cretaceous and Tertiary are regional or partial cap rocks. Migration and accumulation of hydrocarbon occur in the late Cretaceous and early Pliocene epoch. Afghan-Tajik Basin has larger exploration potentials, and residual resources are 2.4¡Á108t. The potential zones are as follows, south part of basin, oil-gas structures of post-salt, reef limestone of pre-salt, and litho-stratigraphic traps.

GEOLOGIC EVOLUTION AND HYDROCARBON HABITAT GIPPSLAND BASIN

1972 ◽  
Vol 12 (1) ◽  
pp. 132 ◽  
Author(s):  
J. Barry Hocking
Keyword(s):  
Late Cretaceous ◽  
Upper Cretaceous ◽  
Meteoric Water ◽  
Oil And Gas ◽  
Basin Evolution ◽  
Fold Belt ◽  
Apparent Lack ◽  
Northern Flank ◽  
Southeastern Australia ◽  
Gippsland Basin

The Gippsland Basin of southeastern Australia is a post-orogenic, continental margin type of basin of Upper Cretaceous-Cainozoic age.Gippsland Basin evolution can be traced back to the establishment of the Strzelecki Basin, or ancestral Gippsland Basin, during the Jurassic. Gippsland Basin sedimentation commenced in the middle to late Cretaceous and is represented as a gross transgressive-regressive cycle consisting of the continental Latrobe Valley Group (Upper Cretaceous to Eocene or Miocene), the marine Seaspray Group (Oligocene to Pliocene or Recent), and finally the continental Sale Group (Pliocene to Recent).The hydrocarbons of the Gippsland Shelf petroleum province were generated within the Latrobe Valley Group and are trapped in porous fluvio-deltaic sandstones of the Latrobe. At Lakes Entrance, however, oil and gas are present in a marginal sandy facies of the Lakes Entrance Formation (Seaspray Group).The buried Strzelecki Basin has played a fundamental role in the development and distribution of the Cainozoic fold belt in the northern Gippsland Basin. The Gippsland Shelf hydrocarbon accumulations fall within this belt and are primarily structural traps. The apparent lack of structural accumulations onshore in Gippsland is largely due to a Plio-Pleistocene episode of cratonic uplift that was accompanied by basinward tilting of structures and meteoric water influx.The non-commercial Lakes Entrance field, located on the stable northern flank of the basin, is a stratigraphic trap and may serve as a guide for future exploration.

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