Ground water contamination from septic systems and the application of dairy cattle manure has been a long-standing problem in rural northeastern Wisconsin, especially areas with thin soils over karstified Silurian dolostone bedrock, where as many 60% wells show evidence fecal contamination. We present results citizen science supported water-isotope study Kewaunee County, Wisconsin to evaluate a...

The meteoric water has obviously changed the physical properties of dolostone reservoirs in vertical vadose zone and horizontal phreatic zone, but its influence on shallow burial beneath surface is still unclear. This study aims to reveal effect through X-ray diffraction, cathodoluminescence, C, O, Sr isotope using sample from Majiagou Formation Daniudi gas field, Ordos Basin. diagenesis parage...

Abstract Results of our study based on examination induced precipitation carbonate by a cyanobacterium, Lyngbya in the laboratory, and analyses microphotographs both modern ancient microbial carbonates, demonstrated importance recognition mold holes crusts understanding carbonates. In experiment, only cyanobacteria can induce carbonate, forming scattered grains surface filaments. Carbonate encl...

Human activities and natural factors determine the hydrogeochemical characteristics of karst groundwaters their use as drinking water. This study assesses 14 water sources in Apuseni Mountains (NW Romania) potential sources. As shown by Durov Piper diagrams, chemical composition waters is typical it dominated HCO3− Ca2+, having a circumneutral to alkaline pH total dissolved solids ranging betwe...

In order to understand spatial variations of stable isotope geochemistry in the Quruqtagh basin (northwestern China) in the aftermath of an Ediacaran glaciation, we analyzed carbonate carbon isotopes (dCcarb), carbonate oxygen isotopes (dOcarb), carbonate associated sulfate sulfur (d SCAS) and oxygen isotopes (d OCAS), and pyrite sulfur isotopes (d Spy) of a cap dolostone atop the Ediacaran Han...

Understanding the extreme carbon isotope excursions found in carbonate rocks of the Ediacaran Period (635–541 Ma), where dC of marine carbonates (dCcarb) reach their minimum ( 12&) for Earth history, is one of the most vexing problems in Precambrian geology. Known colloquially as the ‘Shuram’ excursion, the event has been interpreted by many as a product of a profoundly different Ediacaran carb...

Recently, 15.1 billion tons of shale oil geological resources were discovered in the Qingshankou Formation Gulong Sag, Songliao Basin, and this discovery has attracted considerable attention. Thus far, sedimentary environment diagenetic process particularly reservoir space accumulation mechanism oil, are unclear, which seriously affected exploration development oil. Based on detailed core thin ...

The deeply buried carbonate reservoir of Cambrian is an important target oil and gas exploration in the Tarim Basin. Understanding dissolution mechanism deep-buried urgent problem to be solved. In this study, 11 samples from three types deep reservoirs Basin were selected as experimental objects, process was simulated by using advanced reaction system continuous flow at high temperature pressur...

A gravel pit in south central Stearns County, Minnesota exposes sand and gravel of the Merden Lake esker which is thought to have been deposited by a subglacial stream associated with the Wisconsinan-aged Superior Lobe of the Laurentide ice sheet. An analysis of these sediments was conducted from samples collected through a vertical trench on an east-facing exposure of the gravel pit. A total o...