scholarly journals The recent history of the Galapagos triple junction preserved on the Pacific plate

2013 ◽  
Vol 371-372 ◽  
pp. 6-15 ◽  
Author(s):  
Deborah K. Smith ◽  
Hans Schouten ◽  
Laurent Montési ◽  
Wenlu Zhu
2016 ◽  
Vol 2 (7) ◽  
pp. e1600022 ◽  
Author(s):  
Lydian M. Boschman ◽  
Douwe J. J. van Hinsbergen

The oceanic Pacific Plate started forming in Early Jurassic time within the vast Panthalassa Ocean that surrounded the supercontinent Pangea, and contains the oldest lithosphere that can directly constrain the geodynamic history of the circum-Pangean Earth. We show that the geometry of the oldest marine magnetic anomalies of the Pacific Plate attests to a unique plate kinematic event that sparked the plate’s birth at virtually a point location, surrounded by the Izanagi, Farallon, and Phoenix Plates. We reconstruct the unstable triple junction that caused the plate reorganization, which led to the birth of the Pacific Plate, and present a model of the plate tectonic configuration that preconditioned this event. We show that a stable but migrating triple junction involving the gradual cessation of intraoceanic Panthalassa subduction culminated in the formation of an unstable transform-transform-transform triple junction. The consequent plate boundary reorganization resulted in the formation of a stable triangular three-ridge system from which the nascent Pacific Plate expanded. We link the birth of the Pacific Plate to the regional termination of intra-Panthalassa subduction. Remnants thereof have been identified in the deep lower mantle of which the locations may provide paleolongitudinal control on the absolute location of the early Pacific Plate. Our results constitute an essential step in unraveling the plate tectonic evolution of “Thalassa Incognita” that comprises the comprehensive Panthalassa Ocean surrounding Pangea.


2014 ◽  
Vol 14 (2) ◽  
pp. 215-230 ◽  
Author(s):  
Jukka Siikala

Looking at recent turmoil in political processes in the Pacific, the article discusses the relationship of socio-cosmic holism and hierarchy in Tonga, Samoa and Fiji to western ideologies of democracy and individualism. Incorporation of traditional chieftainship into colonial and postcolonial state structures has had different outcomes in each case. The structural arrangements, which according to Dumont are seen as intermediary forms, are looked at using material from the recent history of the societies. Thus the riots in Nukuʻalofa orchestrated by the Tongan democracy movement, the military coup in Fiji and the multiplication of chiefly titles in Samoa are seen as results of the interplay of local and western ideologies culminating in notions of holism and individualism.


2007 ◽  
Author(s):  
Eileen Ahearn ◽  
Mary Mussey ◽  
Catherine Johnson ◽  
Amy Krohn ◽  
Timothy Juergens ◽  
...  

2007 ◽  
Vol 4 (3) ◽  
pp. 331-358
Author(s):  
WEN-CHIN OUYANG

I begin my exploration of ‘Ali Mubarak (1823/4–1893) and the discourses on modernization ‘performed’ in his only attempt at fiction, ‘Alam al-Din (The Sign of Religion, 1882), with a quote from Guy Davenport because it elegantly sums up a key theoretical principle underpinning any discussion of cultural transformation and, more particularly, of modernization. Locating ‘Ali Mubarak and his only fictional work at the juncture of the transformation from the ‘traditional’ to the ‘modern’ in the recent history of Arab culture and of Arabic narrative, I find Davenport's pronouncement tantalizingly appropriate. He not only places the stakes of history and geography in one another, but simultaneously opens up the imagination to the combined forces of time and space that stand behind these two distinct yet related disciplines.


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