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| LARGE IGNEOUS PROVINCE ON THE UNITED-STATES ATLANTIC MARGIN AND IMPLICATIONS FOR MAGMATISM DURING CONTINENTAL BREAKUP |
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| Author(s): HOLBROOK WS, KELEMEN PB |
| Source: NATURE Volume: 364 Issue: 6436 Pages: 433-436 Published: JUL 29 1993 |
| Times Cited: 118 References: 35 |
| Abstract: RIFTED continental margins commonly include sections of igneous rock more than twice as thick as normal oceanic crust. Explanations for this voluminous magmatic accretion during rifting include plume models1-3, which require a deep-seated thermal or chemical anomaly in upwelling mantle, and non-plume models4-7, which call on broad, shallow thermal anomalies and/;or rapid upwelling of mantle through the melting zone. New seismic models from two transects across the continent ocean transition on the US Atlantic margin8-10 confirm the presence of a 20-25-km-thick igneous section. Here we argue that the similarity of the crustal structure on these and two previous transects, spanning 1,000 km of the margin, and the association of thick igneous crust with the East Coast magnetic anomaly11 imply that the thick igneous section extends along the entire margin and may have a volume of as much as 3.2 x 10(6) km3. The distribution of volcanic and plutonic rocks, details of the seismic structure, and lack of independent evidence for a hotspot are difficult to reconcile with plume models and suggest that non-plume processes created the thick igneous crust. |
| Document Type: Article |
| Language: English |
| Reprint Address: HOLBROOK, WS (reprint author), WOODS HOLE OCEANOG INST, WOODS HOLE, MA 02543 USA |
| Publisher: MACMILLAN MAGAZINES LTD, PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW |
| Subject Category: Multidisciplinary Sciences |
| IDS Number: LP640 |
| ISSN: 0028-0836 |
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