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Caraga Region is located at northeastern part of Mindanao. It has five (5) provinces, namely: Dinagat Province, Surigao del Norte, Surigao del Sur, Agusan del Norte and Agusan del Sur. Caraga Region is now hosting several mining projects producing various mineral commodities particularly but not limited to gold, copper, chrome, nickel, iron and limestone for concrete cement production. This makes the Department of Environment and Natural Resources,〔''Department of Environment and Natural Resources (Philippines)'' An executive Department of the Republic of the Philippines mandated to supervise judicious utilization and development of the country's natural resources. (visit website )〕 Mines and Geosciences Bureau,〔(Mines and Geosciences Bureau ) A line bureau under the Department of Environment and Natural Resources mandated to supervise licensing of mining permits and contracts, development and disposition of mineral resources, mining environment, health and safety, among others.〕 Regional Office No. 13〔(DENR-MGB Regional Office No. 13 ) is located in Surigao City, rather than Butuan City (the region's capital), by virtue of Sec. 2, Republic Act No. 7901 - An Act Creating Region XIII to be known as the Caraga Administrative Region, and for other purposes〕 with Office located in Surigao City plays important role in the region's economy, job generation, social and environmental enhancement and protection and ensuring government shares through royalties and taxes. Caraga Region is one of the regions notably located in the eastern seaboard of the Philippines. With its geographic location facing the Pacific Ocean and famous Philippine Trench, the Region is prone to various weather conditions and geologic phenomenon like, but not limited to, typhoon, tsunami and other coastal surges and seismic activities. With these, DENR-MGB13 is expeditiously utilizing its human and financial resources to generate geohazard maps as necessary source of information to spatial planners and other government and non-government agencies working for public safety and disaster management. == General Geology == In the broader physiographic framework of the Philippine archipelago, Caraga Region occupies the northernmost portion of the Eastern Mindanao Ridge or Mindanao Pacific Cordillera, a more than 400-km, NNW-SSE trending orogenic belt comprising eastern Mindanao. The Mindanao Pacific Cordillera is bounded by two major structures that played a key role in the neotectonic evolution of the Philippine Mobile Belt, namely the Philippine Trench and the Philippine Fault Zone. The geologic evolution of the Mindanao Pacific Cordillera was largely controlled by convergent and transcurrent tectonics intermittently active during Upper Cretaceous to Pleistocene times. These complex tectonic processes brought about the justaposition of older metamorphic basement rocks with ophiolite suite of rocks later superposed by younger multiple stage island arc volcano-sedimentary sequences. The broad geomorphic configuration of the region is largely controlled by these tectonic processes of the past. Oldest rocks in the region are pre-Tertiary metamorphics and ophiolitic suite of rocks of Cretaceous age. Limited exposures of post-ophiolitic sedimentary rocks of Eocene age suggest dominant erosional processes from Paleocene to Eocene period. On the contrary, the Oligocene to Middle Miocene age is marked by thick accumulation of arc basaltic volcano-sedimentary sequence and turbidites later succeeded by mid-Miocene to Pliocene volcanic flows, pyroclastics and epiclastic of more andesitic composition. Arc magmatism was also active during the mid-Miocene to Pliocene times generating monzonitic and dioritic stocks and plutons and hornblende andesite porphyry intrusions. In areas away from paleo-volcanic centers, thick sedimentary clastic rocks with sporadic limestone horizons and intercalated calcareous sediments, marls and/or coal seams were formed during the Miocene to Pliocene. Reefal limestone, some of dubious stratigraphic position unconformably capped older rocks with age assignment ranging from Miocene to Plio-Pleistocene. The Paco-Maniayao volcanic complex north of Lake Mainit represents the latest Quaternary volcanism in the region. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mines and Geosciences Bureau Region 13 (Philippines)」の詳細全文を読む スポンサード リンク
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