Widespread exploration for oil and gas in the Niigata oil and gas fields, involving extensive drilling, has shown that Early to Middle Miocene volcanic rocks bearing the petroleum and natural gas are extensively developed, and they have been buried at depths greater than 4,000-6,000m since the Middle Miocene. We determined Sr and Nd isotopic ratios of volcanic rocks recovered by deep drilling at thirteen wells in the fields. The present and our previous data demonstrate that these deep-seated basaltic rocks older than about 16 Ma have lower NdI (initiaI^143Nd/^144Nd ratios) compared to those younger than 16 Ma. The former NdI (0.51264 to 0.51284) are within the Nd isotopic range of an undepleted source mantle shown by NdI of basaltic rocks ...
Island arc lavas from New Britain and the Marianas have ^(143)Nd/^(144)Nd similar to other oceanic b...
Legs 127 and 128 of the Ocean Drilling Program cored basement samples from two sites in the Yamato B...
The Nankai Hydrate Field, Japan, is an example of gas hydrate deposits associated with an active sub...
One determination of Sr and Nd isotopic ratios of Early to Middle Miocene volcanic rocks recovered b...
The underground volcanic activity before middle Miocene in the Niigata oil and gas fields are dlvide...
Nd and Sr isotopic analyses were made on selected volcanic rocks of known stratigraphic age from a l...
Two older granitic rocks and some selected Quaternary volcanic rocks from the Japanese Islands were ...
The "Miocene Regional Basalts", proposed here by the authors, include basalts and dolerites of the N...
During IODP Expedition 322, an interval of Late Miocene (7.6 to ∼9.1 Ma) tuffaceous and volcaniclast...
Deep drilling in the Japan Sea during Legs 127 and 128 resulted in recovery of volcanic lithic sands...
Japanese WESTPAC Symposium. June 6-7, 1989. Ocean Research Institute, University of Tokyo. 西太平洋におけるマ...
Major and trace elements, mineral chemistry, and Sr-Nd isotope ratios are reported for representativ...
Article appears in Proceedings of the Ocean Drilling Program, Scientific Results.The Sr, Nd, and Pb ...
Sr and Nd isotopic compositions are reported for basaltic rocks collected during ODP Leg 127 from th...
New Sr- Nd- and Pb-isotopic and trace element data are presented on basalts from the Sulu and Celebe...
Island arc lavas from New Britain and the Marianas have ^(143)Nd/^(144)Nd similar to other oceanic b...
Legs 127 and 128 of the Ocean Drilling Program cored basement samples from two sites in the Yamato B...
The Nankai Hydrate Field, Japan, is an example of gas hydrate deposits associated with an active sub...
One determination of Sr and Nd isotopic ratios of Early to Middle Miocene volcanic rocks recovered b...
The underground volcanic activity before middle Miocene in the Niigata oil and gas fields are dlvide...
Nd and Sr isotopic analyses were made on selected volcanic rocks of known stratigraphic age from a l...
Two older granitic rocks and some selected Quaternary volcanic rocks from the Japanese Islands were ...
The "Miocene Regional Basalts", proposed here by the authors, include basalts and dolerites of the N...
During IODP Expedition 322, an interval of Late Miocene (7.6 to ∼9.1 Ma) tuffaceous and volcaniclast...
Deep drilling in the Japan Sea during Legs 127 and 128 resulted in recovery of volcanic lithic sands...
Japanese WESTPAC Symposium. June 6-7, 1989. Ocean Research Institute, University of Tokyo. 西太平洋におけるマ...
Major and trace elements, mineral chemistry, and Sr-Nd isotope ratios are reported for representativ...
Article appears in Proceedings of the Ocean Drilling Program, Scientific Results.The Sr, Nd, and Pb ...
Sr and Nd isotopic compositions are reported for basaltic rocks collected during ODP Leg 127 from th...
New Sr- Nd- and Pb-isotopic and trace element data are presented on basalts from the Sulu and Celebe...
Island arc lavas from New Britain and the Marianas have ^(143)Nd/^(144)Nd similar to other oceanic b...
Legs 127 and 128 of the Ocean Drilling Program cored basement samples from two sites in the Yamato B...
The Nankai Hydrate Field, Japan, is an example of gas hydrate deposits associated with an active sub...