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09 Jan 2021
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Geological survey surrounding Thamluang Khunnam Nangnon Forest Park
Geologic base map scale 1:10,000 surrounding Thamluang Khunnam Nangnon Forest Park

Geological survey surrounding Thamluang Khunnam Nangnon Forest Park under the survey on geology and hydrogeology of limestone mountain range, Thamluang Khunnam Nangnon Forest Park Project in fiscal year 2019. The survey results showed that the geological characteristics surrounding Thamluang Khunnam Nangnon Forest Park have two directions of geological structures e.g., N-S and E-W. The survey of primary structure e.g. rock stratum and secondary structure e.g. fold, fault, cleavage, and fracture. The geology surrounding Thamluang Khunnam Nangnon comprises marble as majority, some area is still limestone with the collection of fossils such as brachiopod, crinoids, coral reef, and foraminifera etc. which are potentially and significantly important on geological research.

Marble layer (left) and limestone with snail fossil (right) from polarized microscope from lower stratum of Thamluang Khunnam Nangnon limestone mountain range
Stereonet shows fold structure surrounding Thamluang Khunnam Nangnon Forest Park
Classification of intrusive igneous rock surrounding Thamluang Khunnam Nangnon Forest Park in QAPF diagram
Survey and geologic mapping in Eastern Economic Corridor (EEC)

The project of potential rock for construction industry site in Eastern Economic Corridor area consisting of Chonburi province, Rayong province, and Chachoengsao province is in the east coastal of Thailand covering 13,299 sq.km. The cabinet primary approved the Eastern Economic Corridor project on June 28, 2016 (published in the Royal Thai Government Gazette on May 14, 2018).

The government will fund the development of transportation and logistics network in 2017-2021 (road, train, pier, and airport) to be efficient, up to date, and meet the international standard supporting the economic network such as the high speed rail, Bangkok-Rayong project, the double track railway, Chachoengsao-Klong 19- Kaeng Khoi project, Motorway No. 7 project, Development of Leam Chabang port supporting vessel transportation, Mab Ta Phut port, Sattahip commercial port supporting business man and tourist, and Utapao airport development etc.

In fiscal year 2018, Department of Mineral Resources assigned Standard and geology data Sections, Geology Division to prepare the database of potential rock for construction industry site in Eastern Economic Corridor area under the integrated national minerals management, industry rock management project complying with Minerals Act B.E. 2560 applying geology data, database of industry rock of Department of Mineral Resources, rock for construction industry site, together with surveying, analyzing rock in field, and data processing with geographic information system. The results revealed that Eastern Economic Corridor area has 204 rock for construction industry sites totally 1,369 sq.km. consisting of limestone approximately 30 sq.km., granite 969 sq.km., gneiss/schist approximately 212 sq.km., and ryolite/andesite approximately 158 sq.km.

Geologic map of Eastern Economic Corridor area
Landform of Doi Nangnon, Mae Sai district, Chiang Rai province
Study of geology and karst landform at Doi Nangnon, Mae Sai district, Chiang Rai province

covering the study area approximately 350 sq.km. The results showed that the area comprised rock and sediment classified as 4 units which are 1) limestone in Carboniferous- Permian period, 2) sandstone, bedrock, and gravel in Permian- Triassic period, 3) granite in Triassic period, and 4) sediment in Tertiary period. The karst landform in this study were found in limestone unit continuously corroded by rain resulting in karst topography. The karst topography found in the area are at least 8 types which are 1) cone karst, 2) tower karst, 3) doline and sinkhole, 4) uvala, 5) polje, 6) karst lake, 7) karst spring, and 8) pinnacle.

Study of water geomorphology and sedimentology at Mae Sai pool, Mae Jun-Mae Sai-Chiang San district, Chiang Rai province

covering the study area approximately 1,200 sq.km. Mae Sai pool is in the tip of Chiang Rai pool forming in the end of Paleogene period. There is the sediment run off from the mountain continuously collecting to the present. The landform can be classified as 12 forms e.g. 1) flood plain, 2) oxbow lake, 3) alluvial fan, 4) active channel and sand bar, 5) valley plain, 6) natural levee, 7) crevasse splay, 8) swamp, 9) old channel belt deposits, 10) abandoned channel, 11) colluvium deposits, and 12) residual soil. The alluvial fan covers approximately 70% of Mae Sai pool, follow by flood plain, old channel belt deposits, and abandoned channel, respectively. The rest is rarely found.

Map of water geomorphology and sedimentology at Mae Sai pool, Mae Jun-Mae Sai-Chiang San district, Chiang Rai province

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