Publication Date:
2023-06-27
Description:
Leg 61 of the Deep Sea Drilling Project (DSDP) was concerned with drilling a single continuously cored multiple re-entry hole at site 462 in the Central Nauru Basin (Fig. 1). Preliminary results of this drilling, which penetrated more than 1 km beneath the sea floor, were presented earlier. One major result was the discovery of a late Cretaceous off-ridge volcanic/intrusive complex of basaltic composition and great thickness (〉500 m). We now present trace element abundance data for these basalts. Results of the drilling provide further support for a relatively long-lived thermal and magmatic event in the late Cretaceous resulting in voluminous and widespread magmatism in the central and western Pacific consistent with earlier suggestions. The trace element data show that most of the rocks produced during this event have trace element characteristics intermediate between those of normal and transitional mid-ocean ridge basalts (N- and T-type MORB) and different from Hawaiian basalts. These results indicate that basalts which are depleted in light rare earth elements (LREE) relative to the heavy REE may, in certain conditions, be erupted as voluminous intra-plate eruptions far from active ridge crests.
Keywords:
30-289; 61-462; 61-462A; Aluminium oxide; Calcium oxide; Cerium; Chromium; Cobalt; Deep Sea Drilling Project; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Elements, total; Europium; Event label; Glomar Challenger; Hafnium; Instrumental neutron activation analysis (INAA); Iron oxide, Fe2O3; Iron oxide, FeO; Lanthanum; Leg30; Leg61; Lutetium; Magnesium oxide; Manganese oxide; Phosphorus pentoxide; Potassium oxide; Samarium; Sample code/label; Scandium; Silicon dioxide; Sodium oxide; South Pacific/PLATEAU; Terbium; Titanium dioxide; Water in rock; Ytterbium
Type:
Dataset
Format:
text/tab-separated-values, 90 data points
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