ASEAN Minerals Information

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ASEAN Minerals Information

General Information of Khon Kaen Geopark

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Abstract

Department of Mineral Resources has been surveying and evaluating geosites around Khan Kaen area since 2012. Many sites of these are world class designation especially dinosaur sites. Nowadays, there are 4 new species of dinosaur were found here which are Phuwiangosaurus sirindhorne, Siamosaurus suteethorni, Ginnareemimus khonkaenensis and Siamotyrannus isanensis. Furthermore, archaeological site and cultural sites discovered in this area also be a good combination to set up geopark because geopark is not only about geology but also culture, history and other nature aspects.

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Facies Characteristics of the Late Cretaceous-Paleogene Phu Khat Formation in the Nakhon Thai region

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Abstract

The Late Cretaceous to the Early Paleogene sediments of the Phu Khat Formation are well exposed in the Nakhon Thai region located in the lower port of northern Thailand. The rocks are characterized by immature and unsorted textures of clastic rocks with high unstable volcanic lithic fragments. The thickness throughout the formation following the detailed section measurement in the Nakhon Thai region is approximately 500 m. The formation can be subdivided into two large units, i.e., the lower sequence (the lower and the middle Phu Khat Formation) and the upper sequence (the upper Phu Khat Formation) which is composed of nine lithofacies including Gms, Gm, Ss, Sh, Sp, Sr, Fl, Fm and Fsc within three facies  associations i.e., facies association A, Band C. Based on the facies association, the Phu Khat Formation is largely interpreted to have been deposited by alluvial fan in the lower sequence and fluvial braided  stream  in the upper sequence. The lower sequences are mainly characterized by the succession of alluvial fan facies consisting of facies association A and B.

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Discovery of Devonian to Carboniferous Radiolarians from Central Thailand

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Abstract

A Late Devonian to Early Carboniferous radiolarian fauna is present in siliceous shale from the Ban Rai area, Uthai Thani province, central Thailand. The radiolarian fauna is composed of Trilonche palimbola, T elegans, Trilonche sp. cf T echinata, T davidi, T vetusta, Spongentactinia carynacantha, Stigmosphaerastylus variospina, Astraentactinia stellata, Astraentactinia mirausi, Archocyrtium sp., Albaillella paradoxa gr. and other species and corresponds to Late Devonian (Frasnian) to Early Carboniferous (Tournaisian) radiolarian fauna  reported from northern and southern Thailand, Laos, eastern Australia, Texas, Germany, South China and France. Fourteen radiolarian species belonging to seven genera are investigated. The radiolarian-baring rocks seem to have been accumulated around the continental slope on the passive continental margin of the Sibumasu terrane within the Paleo-Tethys ocean during Late Devonian to Early Carboniferous time.

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Depositional environment of Late Devonian Chert/Shale Sequences

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Abstract

Depositional environment of the deep marine sequences including the Late Devonian chert/siliceous shale sequences from the Truong Son and the Loei Fold belts are of importance in order to discriminate their basin evolution and tectonic scenario.

Radiolarian dating of the selected sections along with geochemical discriminations include rare earth element (REE) and major element analyses ore applied for these aspects. In the central part of Lao PDR within the Truong Son Fold belt a new locality of Late Devonian radiolarian chert and siliceous shale outcrops in the Vilabouly area, Sepon district together with radiolarian-bearing siliceous shale from the Bon Phonxoi section approximately 100 km. further north were selected.

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Application of Remote Sensing Imagery and GIS for Horizontal Shoreline Change Detection

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Abstract

Various optical remote sensing imageries, including digital orthophoto, color aerial photograph, SPOT 5, and Thaichote (THEOS), used to delineate sandy shoreline at the Chalatat Beach extending southeastward to Ban Kao Seng village. Sobel method of edge enhancement was adopted to improve the quality of remote sensing data. Tree alignment was defined to be as baseline in order to help clearly detecting, measuring, and comparing horizontal sandy shoreline change. The study was found that the three status of shoreline occurred, including stable to slightly change, accretion or deposition and also erosional shoreline. The latest seems to be the severe problem in study area.  All status of shoreline was mainly caused by human activities. Simple overlay technique of multi-dote shorelines of 2003, 2006, 2009, and 2011, gave a lot of erosional and depositional evident, which coincided with offshore investigation data such as sea depth and change of sea floor profile. Sand sediment was deposited behind T-groin at Ban Kao Seng village, and long shore sediment was accumulated at the sometime. On the other hand, in case of sediments beneath sea surface moved out, the shoreline erosion will be occurred, especially along the Chalatat beach.

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