| Abstract: | Planktic foraminiferal provinces of Caribbean DSDP Hole 502A and East Pacific DSDP Hole 503A have been analyzed and compared with benthic and planktic isotope records, carbonate, hiatus events, and sea level changes. Four major events are evident in the closure history of the Pacific-Caribbean gateway, at 6.2, 4.2, 2.4 and 1.8 Ma. The faunal change at 6.2 Ma coincides with the ??13C shift and is primarily caused by upwelling in the western Caribbean. This suggests restricted circulation of intermediate water and deflection northeastward, strengthening the Gulf Stream as reflected in the first major erosion on Blake Plateau. The second faunal change, at 4.2 Ma, coincides with increased surface water salinity evident in ??18O data and indicates increasingly restricted surface water exchange. Divergence of faunal provinces beginning at 2.4 Ma is marked by increasing abundance of high salinity tolerant species (Globigerinoides ruber) in the Caribbean. This suggests that initial closure of the Pacific-Caribbean gateway and cessation of sustained surface current flow between the Pacific and Caribbean occurred as late as 2.4 Ma. Maximum divergence of faunal provinces begins at 1.8 Ma and continues to the present. This implies that at least incipient littoral-neritic leakage occurred across the Pacific-Caribbean gateway between 2.4 and 1.8 Ma, with final closure by 1.8 Ma. ?? 1989. |
| Genre: | Article |
| ProdID: | 70015477 |
| Citation Author: | Keller, G.; Zenker, C. E.; Stone, S. M. |
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| Citation End Page: | 108 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of South American Earth Sciences |
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| Citation Number Of Pages: | 36 |
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| Citation Search Results Text: | Late neogene history of the Pacific-Caribbean gateway; 1989; Article; Journal; Journal of South American Earth Sciences; Keller, G.; Zenker, C. E.; Stone, S. M. |
| Citation Start Page: | 73 |
| Citation Volume: | 2 |
| Citation Year: | 1989 |
| Type: | citation/reference |
| Text: | Late neogene history of the Pacific-Caribbean gateway; 1989; Article; Journal; Journal of South American Earth Sciences; Keller, G.; Zenker, C. E.; Stone, S. M. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1989 00:00 -0600 |
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