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Melanges: Processes of Formation and Societal Significance

Product Code: USPE480
Series: GSA Special Papers
Author/Editor: Edited by John Wakabayashi and Yildirim Dilek
Publication Date: 30 August 2011
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Special offer price £23 (usual price £65 / GSA&GSL £45)

GSA Special Paper 480.

Mélanges are among the most important components of orogenic belts, and they give insights into the mode, nature, and physical conditions of those geological processes involved in plate margin evolution and orogenic belt development. They comprise blocks of varied lithologies and origins, commonly embedded in an argillitic, sandy, or serpentinite matrix. Beyond their scientific intrigue and importance, mélanges also have societal significance, because most engineering projects and studies have failed to adequately characterize their chaotic structure. The chapters in this volume highlight the richness and variety of recent research on mélanges that employs new methodology, approaches, and interpretations, which emerged in the 27 years following the 1984 publication of the benchmark GSA Special Paper 198 on mélanges. In addition to featuring new directions in interdisciplinary research on mélanges, this volume is truly international, both in terms of the nationality of the authors and the geographic coverage of the reported mélange studies.

 

Type: Book
Ten Digit ISBN:
Thirteen Digit ISBN: 9780813724805
Publisher: GSA
Binding: Paperback
Pages: 279
Weight: 1.0 kg

Contents

Introduction: Characteristics and tectonic settings of mélanges, and their significance for societal and engineering problems
John Wakabayashi and Yildirim Dilek


Part I. Mélange Generation in Oceanic Fracture Zones in Abyssal Settings

1. Serpentinite matrix mélange: Implications of mixed provenance for mélange formation
John W. Shervais, Sung Hi Choi, Warren D. Sharp, Jeffrey Ross, Marchell Zoglman-Schuman, and Samuel B. Mukasa
2. Geochemical mapping of the Kings-Kaweah ophiolite belt, California—Evidence for progressive mélange formation in a large offset transform-subduction initiation environment
J. Saleeby

Part II. Mélange Formation Associated with Subduction Initiation

3. Constraints on the evolution of the Mesohellenic Ophiolite from subophiolitic metamorphic rocks
R. Myhill
4. Role of plutonic and metamorphic block exhumation in a forearc ophiolite mélange belt: An example from the Mineoka belt, Japan
Ryota Mori, Yujiro Ogawa, Naoto Hirano, Toshiaki Tsunogae, Masanori Kurosawa, and Tae Chiba

Part III. Mélange Development in Subduction-Accretion Complexes and in Collisional Settings

5. Mélanges of the Franciscan Complex, California: Diverse structural settings, evidence for sedimentary mixing, and their connection to subduction processes
John Wakabayashi
6. Tectonic evolution of the Ankara Mélange and associated Eldivan ophiolite near Hançili, central Turkey
Anne Dangerfield, Ron Harris, Ender Sarifakioglu, and Yildirim Dilek
7. Petrology of a Franciscan olistostrome with a massive sandstone matrix: The King Ridge Road mélange at Cazadero, California
Rolfe Erickson
8. Sedimentary block-in-matrix fabric affected by tectonic shear, Miocene Nabae complex, Japan
Soichi Osozawa, Terry Pavlis, and Martin F.J. Flower
9. Numerical estimation of duplex thickening in a deep-level accretionary prism: A proposal for network duplex
Hikaru Ueno, Ken-ichiro Hisada, and Yujiro Ogawa
10. Tectonic, sedimentary, and diapiric formation of the Messinian mélange: Tertiary Piedmont Basin (northwestern Italy)
Andrea Festa
11. Recognition of a trench-fill type accretionary prism: Thrust-anticlines, duplexes, and chaotic deposits of the Pliocene-Pleistocene Chikura Group, Boso Peninsula, Japan
Satoru Muraoka and Yujiro Ogawa
12. Implication of dark bands in Miocene–Pliocene accretionary prism, Boso Peninsula, central Japan
Yoko Michiguchi and Yujiro Ogawa

Part IV. Significance of Mélanges for Engineering and Applied Geology

13. Geopractitioner approaches to working with antisocial mélanges
Edmund W. Medley and Dimitrios Zekkos

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