A prominent positive GRACE satellite-measured free-air gravity anomaly over regionally depressed subglacial topography may identify a mascon centered on (70oS, 120oE) between the Gamburtsev and Transantarctic Mountains of East Antarctica. Being more than twice the size of the Chicxulub crater, the inferred Wilkes Land impact crater is a strong candidate for a Gondwana source of the greatest extinction of life at the end of the Permian. Its ring structure intersects the coastline and thus may have strongly influenced the rifting of East Antarctica from Australia that resulted in the enigmatic lack of conjugate crustal thinning on the Australian block.
AGU Spring Meeting Abstracts
- Pub Date:
- May 2006
- 6022 Impact phenomena (5420;
- 1219 Gravity anomalies and Earth structure (0920;