--> Abstract: Black Lake Reaction to Red River Course Changes, by Julia H. Battle; #90087 (2009).
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Previous HitBlackNext Hit Lake Reaction to Red River Course Changes

Julia H. Battle
University of Louisiana at Lafayette

The marginal lakes of the lower Red River in Texas, Arkansas and Louisiana are mentioned in geologists (Lyell 1830, Vetch 1906, Fisk 1944 and others), but the only studies that have been done on these lakes are on the recent deposits. This study of Previous HitBlackNext Hit Lake, Natchitoches, Louisiana, compiled borings and test pit data from dams, and bridges and took original Vibra-core samples in the lake bottom and surrounding shores. Core analysis and Carbon- 14 dating of organic matter has revealed an unconformity in the depositional record. This unconformity coincides with base level change caused by a course change in the Red River. The Red River diverted its course to the Bayou Bourbeaux course just above Previous HitBlackNext Hit Lake. And this course then captured Previous HitBlackNext Hit Lake Bayou right below Previous HitBlackNext Hit Lake. This capture caused a major base lowering for Previous HitBlackNext Hit Lake Bayou that caused entrenchment and allowed Previous HitBlackNext Hit Lake to drain. A non-depositional/erosional surface and soil formation can be see in the cores taken in Previous HitBlackNext Hit Lake. The Red River again switched its course away from Previous HitBlackNext Hit Lake Bayou allowing the base level to again rise causing aggradation in Previous HitBlackNext Hit Lake Bayou and this in turn allowed the lake to refilled. The more recent sedimentation rates on top of this surface are similar to those seen at other lakes in this region. This study has allowed the dating of the Bayou Bourbeaux course at + 1400ybp, as well as a better understanding of the evolution of Previous HitBlackTop Lake.

AAPG Search and Discover Article #90087 © 2008 AAPG/SEG Student Expo, Houston, Texas