A Lower Cretaceous, syn-extensional magmatic source for a linear belt of positive magnetic anomalies: the Pacific Margin Anomaly (PMA), western Palmer Land, Antarctica

Details A Lower Cretaceous, syn-extensional magmatic source for a linear belt of positive magnetic anomalies: the Pacific Margin Anomaly (PMA), western Palmer Land, Antarctica A Lower Cretaceous, syn-extensional magmatic source for a linear belt of positive magnetic anomalies: the Pacific Margin Anomaly (PMA), western Palmer Land, Antarctica

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998e%26psl.158..143v&link_type=abstract

Earth and Planetary Science Letters, vol. 158, Issue 3-4, pp.143-155

Other

5

Granites, Extension, Gondwana, Island Arcs

Scientific paper

Ar-Ar laserprobe dating suggests that in western Palmer Land, plutons associated with a curvilinear belt of positive magnetic anomalies along the Pacific margin of the Antarctic Peninsula, the Pacific Margin Anomaly (PMA), are Early Cretaceous in age. The new ages, combined with published structural and geochemical studies, suggest that highly magnetically susceptible gabbroic to tonalitic-granodioritic rocks, the probable source of the Palmer Land segment of the PMA, were generated during Early Cretaceous extension when mantle-derived basaltic magma intruded mafic lower to middle crust. Continued extension uplifted newly generated, lower to middle crust through the Curie Isotherm (ca. 600°C) forming the magnetic anomaly. The PMA broadly tracks an arc-parallel band in western Palmer Land where crustal extension and uplift of lower crust were greatest. The close spatial relationship between the PMA and Early Cretaceous, syn-extensional plutons suggests that anomaly area can be used as a crude proxy for the volume of a related plutonic complex; the areal extent of the PMA indicates that a significant proportion of the arc crust was newly generated during the Early Cretaceous in western Palmer Land.

Affiliated with

Also associated with

No associations

Rating

A Lower Cretaceous, syn-extensional magmatic source for a linear belt of positive magnetic anomalies: the Pacific Margin Anomaly (PMA), western Palmer Land, Antarctica does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with A Lower Cretaceous, syn-extensional magmatic source for a linear belt of positive magnetic anomalies: the Pacific Margin Anomaly (PMA), western Palmer Land, Antarctica, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Lower Cretaceous, syn-extensional magmatic source for a linear belt of positive magnetic anomalies: the Pacific Margin Anomaly (PMA), western Palmer Land, Antarctica will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1368828