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Crust-mantle evolution in active arcs
Accepted Manuscript Preface Crust-mantle evolution in active arcs Carla B. Dimalanta, Shu-Kun Hsu, J. Bruce H. Shyu, Decibel V. FaustinoEslava PII: DOI: Reference:
S1367-9120(17)30081-0 http://dx.doi.org/10.1016/j.jseaes.2017.02.027 JAES 2980
To appear in:
Journal of Asian Earth Sciences
Please cite this article as: Dimalanta, C.B., Hsu, S-K., Bruce H. Shyu, J., Faustino-Eslava, D.V., Crust-mantle evolution in active arcs, Journal of Asian Earth Sciences (2017), doi: http://dx.doi.org/10.1016/j.jseaes.2017.02.027
This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Preface Crust-mantle evolution in active arcs Carla B. Dimalanta, Shu-Kun Hsu, J. Bruce H. Shyu and Decibel V. Faustino-Eslava
Introduction The East-Southeast Asia has been regarded as one of the most tectonically complex regions in the world. It is essentially located at junctions between major plate systems, including the Sundaland, the Philippine Sea Plate and the Indo-Australian Plate. The region, thus, presents a very challenging laboratory for understanding the many operative processes that have shaped and continue to shape it. By integrating researches involving geological, structural, paleontological, geochemical, geochronological and geophysical interests on the Philippines and the region, fresh insights are produced that help better explain its geodynamic history. The integration of these different methods advance our understanding on the timing, causes and environmental impacts of tectonic processes, such as the generation of oceanic crust, ophiolite emplacement, magmatism, deposition of sediments, mineralization, earthquake and faulting. Contents of the issue This special issue compiles new works on active and ancient arc systems, the majority of which were presented at the international symposium ‘Crustal-mantle evolution in active arcs’, held in Quezon City, Philippines from 12 to 13 February 2015. The event was attended by researchers from Taiwan, Japan and the Philippines, and featured nearly 50 papers on topics that looked into the various aspects of active and ancient arc systems. In the years leading up to the symposium, these three participating countries established various collaborative researches that anchored on understanding present day processes to decipher ancient ones. This special issue features materials from some of these studies. The number of works on the geochemical properties of sedimentary rocks as a tool for deciphering tectonic histories and paleoclimatic trends has grown over the past decades. In the Philippines, significant information have been gleaned using provenance studies. In this special issue, Pacle et al. examine the petrographic and geochemical signatures of Cenozoic sedimentary sequences of the southern Samar Island, Philippines. This region of the country is of significant regional interest as it lies in the easternmost zone of the archipelago where fragments of the proto-Philippine oceanic plate are thought to be preserved as on-ramped ophiolitic materials. The same
technique was applied by Dimalanta et al. to study the stratigraphic units overlying one of the best-exposed and most-studied ophiolite complexes, the Zambales Ophiolite Complex in Luzon. Suzuki et al. presents an updated model on the development of the Philippine Mobile Belt in northern Luzon from Eocene to Pliocene utilizing modal compositions and major element geochemistry of sandstones that represent the said periods. Fundamental to any arc evolution studies is the comprehension of magmatic processes that add to the crustal mass and provide the platform on which younger rocks are deposited over time. Yumul et al. provides alternative mechanisms for the generation of adakitic rocks in the Masara district in Compostela Valley, Mindanao island, southern Philippines. This region is of interest to many primarily because it is a highly mineralized zone and hosts some of the most productive mines in the Philippines. Padrones et al. looked into the ages of detrital and intrusive rocks in slivers of Sundaland materials that are now accreted to the Philippine archipelago to provide additional constraints on the tectonic evolution of the South China Sea and the Palawan Continental Block. Guotana et al. investigated the petrochemical nature of the uppermost section of an ophiolite in eastern Philippines that is thought to represent an emplaced splinter of the protoPhilippine Sea Plate. Examinations into recent tectonic upheavals provide insights into how the current geodynamic regimes are behaving to not only better constrain our understanding of the modern tectonic setting but also to afford some degree of confidence to our disaster preparedness plans. This issue features the paper by Aurelio et al. that investigates the seismotectonics of a 2012 earthquake event in central Philippines that emanated from a previously unknown fault line. Through the inversion of earthquake focal mechanism solutions, Wu et al. investigated the spatial variations of crustal stress fields in the Philippine region to provide fresh ideas on the tectonic forces in the region. Similarly, Chang et al.’s work on Taiping Island offered new data and insights on the crustal structure of the southern margin of the South China Sea. It is hoped that this JAES Special Issue will make a good reference material and be of great use for anyone studying modern and ancient arcs, particularly in the East and Southeast Asian regions. Acknowledgements The Guest Editors of this special issue would like to thank Prof. Mei-Fu Zhou, Editor-inChief of the Journal of Asian Earth Sciences for his encouragement and support. We also thank all the reviewers who played an important role in maintaining a high level of rigor to the scientific contributions. We thank all the authors, including those whose articles did not reach the final stage of acceptance, for their scholarly contributions to this special issue. The editorial assistance provided by Dianne Chung, Mary Shyla
Sivasubramaniyam and Yanping Hou in the JAES and Elsevier offices are also acknowledged. This special issue is dedicated to the memories of our colleagues, Prof. Bor-Ming Jahn, Tsanyao Frank Yang and Rodolfo Tamayo Jr. whose works have contributed immensely to the understanding of the Asian region’s geodynamics.
S1367-9120(17)30081-0 http://dx.doi.org/10.1016/j.jseaes.2017.02.027 JAES 2980
To appear in:
Journal of Asian Earth Sciences
Please cite this article as: Dimalanta, C.B., Hsu, S-K., Bruce H. Shyu, J., Faustino-Eslava, D.V., Crust-mantle evolution in active arcs, Journal of Asian Earth Sciences (2017), doi: http://dx.doi.org/10.1016/j.jseaes.2017.02.027
This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.
Preface Crust-mantle evolution in active arcs Carla B. Dimalanta, Shu-Kun Hsu, J. Bruce H. Shyu and Decibel V. Faustino-Eslava
Introduction The East-Southeast Asia has been regarded as one of the most tectonically complex regions in the world. It is essentially located at junctions between major plate systems, including the Sundaland, the Philippine Sea Plate and the Indo-Australian Plate. The region, thus, presents a very challenging laboratory for understanding the many operative processes that have shaped and continue to shape it. By integrating researches involving geological, structural, paleontological, geochemical, geochronological and geophysical interests on the Philippines and the region, fresh insights are produced that help better explain its geodynamic history. The integration of these different methods advance our understanding on the timing, causes and environmental impacts of tectonic processes, such as the generation of oceanic crust, ophiolite emplacement, magmatism, deposition of sediments, mineralization, earthquake and faulting. Contents of the issue This special issue compiles new works on active and ancient arc systems, the majority of which were presented at the international symposium ‘Crustal-mantle evolution in active arcs’, held in Quezon City, Philippines from 12 to 13 February 2015. The event was attended by researchers from Taiwan, Japan and the Philippines, and featured nearly 50 papers on topics that looked into the various aspects of active and ancient arc systems. In the years leading up to the symposium, these three participating countries established various collaborative researches that anchored on understanding present day processes to decipher ancient ones. This special issue features materials from some of these studies. The number of works on the geochemical properties of sedimentary rocks as a tool for deciphering tectonic histories and paleoclimatic trends has grown over the past decades. In the Philippines, significant information have been gleaned using provenance studies. In this special issue, Pacle et al. examine the petrographic and geochemical signatures of Cenozoic sedimentary sequences of the southern Samar Island, Philippines. This region of the country is of significant regional interest as it lies in the easternmost zone of the archipelago where fragments of the proto-Philippine oceanic plate are thought to be preserved as on-ramped ophiolitic materials. The same
technique was applied by Dimalanta et al. to study the stratigraphic units overlying one of the best-exposed and most-studied ophiolite complexes, the Zambales Ophiolite Complex in Luzon. Suzuki et al. presents an updated model on the development of the Philippine Mobile Belt in northern Luzon from Eocene to Pliocene utilizing modal compositions and major element geochemistry of sandstones that represent the said periods. Fundamental to any arc evolution studies is the comprehension of magmatic processes that add to the crustal mass and provide the platform on which younger rocks are deposited over time. Yumul et al. provides alternative mechanisms for the generation of adakitic rocks in the Masara district in Compostela Valley, Mindanao island, southern Philippines. This region is of interest to many primarily because it is a highly mineralized zone and hosts some of the most productive mines in the Philippines. Padrones et al. looked into the ages of detrital and intrusive rocks in slivers of Sundaland materials that are now accreted to the Philippine archipelago to provide additional constraints on the tectonic evolution of the South China Sea and the Palawan Continental Block. Guotana et al. investigated the petrochemical nature of the uppermost section of an ophiolite in eastern Philippines that is thought to represent an emplaced splinter of the protoPhilippine Sea Plate. Examinations into recent tectonic upheavals provide insights into how the current geodynamic regimes are behaving to not only better constrain our understanding of the modern tectonic setting but also to afford some degree of confidence to our disaster preparedness plans. This issue features the paper by Aurelio et al. that investigates the seismotectonics of a 2012 earthquake event in central Philippines that emanated from a previously unknown fault line. Through the inversion of earthquake focal mechanism solutions, Wu et al. investigated the spatial variations of crustal stress fields in the Philippine region to provide fresh ideas on the tectonic forces in the region. Similarly, Chang et al.’s work on Taiping Island offered new data and insights on the crustal structure of the southern margin of the South China Sea. It is hoped that this JAES Special Issue will make a good reference material and be of great use for anyone studying modern and ancient arcs, particularly in the East and Southeast Asian regions. Acknowledgements The Guest Editors of this special issue would like to thank Prof. Mei-Fu Zhou, Editor-inChief of the Journal of Asian Earth Sciences for his encouragement and support. We also thank all the reviewers who played an important role in maintaining a high level of rigor to the scientific contributions. We thank all the authors, including those whose articles did not reach the final stage of acceptance, for their scholarly contributions to this special issue. The editorial assistance provided by Dianne Chung, Mary Shyla
Sivasubramaniyam and Yanping Hou in the JAES and Elsevier offices are also acknowledged. This special issue is dedicated to the memories of our colleagues, Prof. Bor-Ming Jahn, Tsanyao Frank Yang and Rodolfo Tamayo Jr. whose works have contributed immensely to the understanding of the Asian region’s geodynamics.