The Ediacaran Period (ca. 635–541 Ma) witnessed the earliest paleontological evidence for macroscopic animals (i.e., Ediacara biota) and geochemical observations of largest carbon cycle anomaly in Earth history Shuram Excursion, SE). Numerous hypotheses have been proposed origins SE, ranging from primary seawater to syn- or post-depositional diagenesis. Despite intensive theoretical work publis...

Abstract Our understanding of the stratigraphic expression astronomically driven climate-change cycles in Milankovitch frequency band has improved significantly recent decades. However, several aspects have been little studied to date, such as nature climatically regulated environmental processes that ultimately control cyclic sedimentation. Similarly, relatively is known about successions accu...

Microporosity hosts a significant portion of the total hydrocarbon volume in Middle Eastern carbonate reservoirs. An improved understanding microcrystals' morphology that micropores, their impact on reservoir properties, and spatial distributions will contribute to more accurate quality prediction. This study proposes methodology utilizes machine learning approaches for microporosity characteri...

ABSTRACT Phanerozoic limestones are composed of low-Mg calcite microcrystals (i.e., micrite) that typically measure between 1 and 9 μm in diameter. These microcrystals, which host most the microporosity subsurface reservoirs, characterized by a variety microtextures. Despite overwhelming consensus diagenetic, origin various textures is widely debated. The commonly reported texture polyhedral ro...

Early-diagenetic cementation of tropical carbonates results from the combination numerous physico-chemical and biological processes. In marine phreatic environment it represents an essential mechanism for development stabilization carbonate platforms. However, diagenetic cements that developed early in are likely to become obliterated during later stages meteoric or burial diagenesis. When lith...

Soil organic matter (OM) is a source of fertility for food provisioning and means climate mitigation. A high pedodiversity observed over very short distances due to both past present land use, such as in Western Africa (Northern Togo), makes this crucial issue. In particular, some small spots covered by sacred forests (forêts sacrées) cultural value area are extremely biodiverse, calcareous OM ...

Douglas Creek arch in western Colorado and eastern Utah separates the Uinta and Piceance Creek basins. During deposition of the lower part of the Eocene Green River Formation, the arch provided a physical barrier dividing ancient Lake Uinta into two segments. As the lake expanded, the arch became a shoal area where marginal-lacustrine and mud flat sediment was deposited. Near the end of Green R...

Abstract. The mechanisms that govern the vertical growth of seep carbonates were deciphered by studying sedimentary architecture a 15 m thick, 8 wide column limestone encased in deep-water marl middle Callovian interval Terres Noires Formation SE France Basin. body, also called “pseudobioherm”, records intense bioturbation, with predominant traces Thalassinoides/Spongeliomorpha suite, excavated...

Thrombolite and stromatolite reefs occur at several stratigraphic levels within the terminal Proterozoic Nama Group (c. 550–543 Ma) of central and southern Namibia. The reefs form integral parts of several carbonate platforms within the Nama Group, including the Kuibis platform of the northern Nama Basin (Zaris subbasin), and Huns platform (Witputs subbasin) of the southern Nama Basin. The reef...

Along the Hikurangi Subduction Margin, accretionary prism uplift has exposed Hungaroa fault zone, an inactive thrust developed within Middle to Late Eocene Wanstead Formation. Within ~33 m-wide core, deformation of smectitic, calcareous mudstone matrix produced a penetrative foliation that locally wraps around clasts. Deformation occurred at temperatures constrained by syntectonic calcite vein ...