Publication Date:
2024-01-09
Description:
Evidence for the Chesapeake Bay Crater as the source for New Jersey continental margin ejecta is provided by fine-grained tektites and coarse-grained unmelted ejecta. The Upper Eocene ejecta deposit, now demonstrated to be part of the North American strewn field, occurs on the New Jersey continental margin at Ocean Drilling Program (ODP) Sites 904 and 903. The mineralogy, major oxide composition of the ejecta materials, and biostratigraphic age of the enclosing sediments link the origin of these ejecta to the recently recognized Chesapeake Bay impact crater, located only 330 km away. Sediments associated with the ejecta provide information about the dynamics of impact events. The 35-cm-thick ejecta-bearing layer can be subdivided into three subunits that indicate a sequence of events. Bottom subunit III documents sediment failure and deposition of gravel-sized fragments, middle subunit II records deposition of abundant sand-sized ejecta by gravity settling, and upper subunit I contains a 12-cm-thick sedimentary deposit containing rare silt-sized tektites and evidence of waning currents. These events are interpreted by linking sediment deposition to seismic ground motion and subsequent tsunami waves triggered by both the Chesapeake Bay impact and slope failures.
Keywords:
150-904A; Aluminium oxide; Aluminium oxide, standard deviation; Calcium oxide; Calcium oxide, standard deviation; Chromium(III) oxide; Chromium(III) oxide, standard deviation; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Electron microprobe (EMP); Iron oxide, FeO; Iron oxide, FeO, standard deviation; Joides Resolution; Leg150; Magnesium oxide; Magnesium oxide, standard deviation; Manganese oxide; Manganese oxide, standard deviation; Number; Ocean Drilling Program; ODP; ORDINAL NUMBER; Phosphorus pentoxide; Phosphorus pentoxide, standard deviation; Potassium oxide; Potassium oxide, standard deviation; Sample code/label; Sample code/label 2; Sample comment; Silicon dioxide; Silicon dioxide, standard deviation; Sodium oxide; Sodium oxide, standard deviation; South Atlantic Ocean; Titanium dioxide; Titanium dioxide, standard deviation
Type:
Dataset
Format:
text/tab-separated-values, 663 data points
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