Abstract
The composition of volcanic rocks erupted in complex plate tectonic settings can provide information on the nature of the underlying mantle. We show here that the geochemistry of alkali basalts from Japan and eastern Asia varies systematically with distance from the Japanese island-arc. Samples from northeastern Japan, relatively close to the Japan Trench, are enriched in K, Sr, Ba and Rb and depleted in Ta, Nb and Ti as compared with samples from southwestern Japan. Both sets show an island-arc influence on their composition, but alkali basalts from still further west (Korea and northeastern China) have chemistries which are indistinguishable from ocean island basalts. We suggest that the northeastern island-arc type of alkali basalts were derived from a 'normal' upper mantle source altered by fluids or melts released from the underlying subducted Pacific plate. The extent of this island-arc-related alteration decreases with distance from the trench.
| Original language | English |
|---|---|
| Pages (from-to) | 55-58 |
| Number of pages | 4 |
| Journal | Nature |
| Volume | 316 |
| Issue number | 6023 |
| DOIs | |
| Publication status | Published - 1985 |
| Externally published | Yes |
Fingerprint
ASJC Scopus subject areas
- General
Cite this
The influence of subduction processes on the geochemistry of Japanese alkaline basalts. / Nakamura, Eizou; Campbell, Ian H.; Sun, Shen Su.
In: Nature, Vol. 316, No. 6023, 1985, p. 55-58.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The influence of subduction processes on the geochemistry of Japanese alkaline basalts
AU - Nakamura, Eizou
AU - Campbell, Ian H.
AU - Sun, Shen Su
PY - 1985
Y1 - 1985
N2 - The composition of volcanic rocks erupted in complex plate tectonic settings can provide information on the nature of the underlying mantle. We show here that the geochemistry of alkali basalts from Japan and eastern Asia varies systematically with distance from the Japanese island-arc. Samples from northeastern Japan, relatively close to the Japan Trench, are enriched in K, Sr, Ba and Rb and depleted in Ta, Nb and Ti as compared with samples from southwestern Japan. Both sets show an island-arc influence on their composition, but alkali basalts from still further west (Korea and northeastern China) have chemistries which are indistinguishable from ocean island basalts. We suggest that the northeastern island-arc type of alkali basalts were derived from a 'normal' upper mantle source altered by fluids or melts released from the underlying subducted Pacific plate. The extent of this island-arc-related alteration decreases with distance from the trench.
AB - The composition of volcanic rocks erupted in complex plate tectonic settings can provide information on the nature of the underlying mantle. We show here that the geochemistry of alkali basalts from Japan and eastern Asia varies systematically with distance from the Japanese island-arc. Samples from northeastern Japan, relatively close to the Japan Trench, are enriched in K, Sr, Ba and Rb and depleted in Ta, Nb and Ti as compared with samples from southwestern Japan. Both sets show an island-arc influence on their composition, but alkali basalts from still further west (Korea and northeastern China) have chemistries which are indistinguishable from ocean island basalts. We suggest that the northeastern island-arc type of alkali basalts were derived from a 'normal' upper mantle source altered by fluids or melts released from the underlying subducted Pacific plate. The extent of this island-arc-related alteration decreases with distance from the trench.
UR - http://www.scopus.com/inward/record.url?scp=0022233844&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0022233844&partnerID=8YFLogxK
U2 - 10.1038/316055a0
DO - 10.1038/316055a0
M3 - Article
AN - SCOPUS:0022233844
VL - 316
SP - 55
EP - 58
JO - Nature
JF - Nature
SN - 0028-0836
IS - 6023
ER -