Abstract Dedolomites, the replacement of dolomite by calcite, are widely distributed in Ordovician Majiagou Formation southeastern Ordos Basin, China, which critically affects reservoir quality throughout region. Two types dedolomites were recognized upper 100 m Formation, namely brecciated dedolomite and crystalline dedolomite. The petrographic geochemical data reveal that investigated often a...

Karst landscapes—regions characterized by sinkholes, caves, springs, underground rivers, and slowly dissolving bedrock— constitute about 25% of the world’s land surface (1). Although some karst landscapes are attractive and of aesthetic value, most of them are recognized as fragile zones unsuitable as human habitats— mainly due to extremely poor soil cover, or a complete lack of soil, and rapid...

In this work, we present as investigation of chalcopyrite leaching under different leach conditions for how liquidation and surface of chalcopyrite study using Scanning Electron Microscopy (SEM) to determine the composition of the passivation layer in the surface of chalcopyrite. The study of chalcopyrite dissolution were in H2SO4 solution systems at pH of 1.2, with 5% chalcopyrite concentrate ...

Sinkhole development occurs in many areas of the world where soluble rocks crop out. Sinkholes are generally the surface expression of the presence of caves and other groundwater flow conduits in carbonate rocks, which are solutionally enlarged secondary permeability features. Their formation may be either natural or caused by man’s activities. In both cases, heavy consequences have to be regis...

Introduction A modified release drug delivery system with prolonged residence time in the stomach is of particular interest for drugs: (a) that are locally acting in the stomach, (b) that have an absorption window in the stomach or in the upper part of small intestine, (c) that are unstable in the intestinal or colonic environments, or (d) have low solubility at high pH values. Systems that pro...

National parks (NPs) are the flagships of protected areas, which primarily serve protection nature, but also important sites for tourism. While karst areas generally disadvantageous in terms traditional farming, tourism can provide new livelihoods those who live there. Therefore, it does matter how local people relate to NP and tourism, opinion tourists is an factor. In this article, we present...

The Grain to Green Program (GTGP) and eco-environmental emigration have been employed to alleviate poverty and control rocky desertification in the Southwest China Karst region. Carbon sequestration and oxygen production (CSOP) is used to indicate major ecological changes, because they involve complex processes of material circulation and energy flow. Using remote sensing images and weather rec...

Cockpit karst landscapes are among the most distinctive landscapes in the world, and have been the focus of long-standing scientific interest. Early researchers used largely descriptive techniques to categorize the terrain, and subsequent work has not attempted to critically re-evaluate descriptions of landscapes using more sophisticated methods. The distinctive surface topography of cockpit ka...