| 释义 |
sphenochasm Geol.|ˈsfiːnəʊkæz(ə)m|
[f. spheno- + Gr. χάσµ-α chasm.]
(See quot. 1958.)
1958S. W. Carey in Continental Drift (Geol. Dept., Univ. of Tasmania, Hobart) 193 A Sphenochasm..is the triangular gap of oceanic crust separating two cratonic blocks with fault margins converging to a point, and interpreted as having originated by the rotation of one of the blocks with respect to the other. 1965A. Holmes Princ. Physical Geol. (ed. 2) xxix. 1086 The Gulf [of California] sphenochasm appears to have been filled with rheid mantle material in much the same way as the Red Sea. 1971Nature 2 July 21/2 As the Gulf of Honduras sphenochasm completed its opening, the Yucatan and Nicaraguan cratons assumed their modern positions relative to North America. |