Description of recent sediments of the East African continental margin

Recent sediments off East Africa coast show 5 fades, parallel the coast: biogene carbonate sand, olivgrey mud, foraminiferal sand, globigerine ooze, and deep sea clay. These sediments decrease progressively in grain size, carbonate content and shell debris away from the coast. They differ in the primary and biogenetic structures, degree of bioturbation, lebensspuren and content of fecal pellets.

Annotated record of the detailed examination of Mn deposits from DEEPSONDE Expedition stations near the East Pacific Rise

Basalts from the base of a small seamount on ~1.5-m.y.-old crust west of the East Pacific Rise (EPR) at 9°N are intermediate in chemical and isotopic composition between light-rare-earth-element-depleted tholeiite (normal midocean ridge basalt (MORB)) and alkali basalt. Like oceanic alkali basalt, these rocks contain significantly more Ba, K, P, Sr, Ti, U, and Zr than normal MORB. Since the absolute abundances of these elements are still well below alkali basalt levels, the label transitional is adopted for these basalts. A series of fractionated MORB also occurs in this area, northwest of the Siqueiros Fracture Zone - Transform Fault. The normal tholeiites are either olivine-plagioclase or plagioclase-clinopyroxene phyric, while the transitional basalts are spinel-olivine phyric. Fractional crystallization quantitatively accounts for the chemical variability of the tholeiitic series but not for the transitional basalts. The tholeiitic series probably evolved in a crustal magma chamber ~4 km below the crest of the East Pacific Rise. 143Nd/144Nd and other chemical data suggest that the large-ion-lithophile-enriched transitional basalts may represent a hybrid of normal MORB and Siqueiros area alkali basalt. Incompatible element plots of K, P, and U indicate possible derivation of the transitional basalts by magma mixing. Magma mixing of unfractionated normal MORB and Siqueiros alkali basalt has been quantified. Derivation of the transitional basalts from a 1:1 mixture is supported by all available chemical data, including Cr, Cu, Nd, Ni, Sm, Sr, U, and V. This magma mixing apparently occurred at ?<~30 km depth within a few tens of kilometers from the EPR axis. These Siqueiros area EPR transitional basalts are compared with Mid-Atlantic Ridge (MAR) transitional basalts from the Iceland and Azores areas. The Siqueiros area basalts reflect a profound chemical and isotopic heterogeneity in the upper mantle, similar to that found along the MAR. Unlike the MAR, the EPR shows no evidence of plumelike bulges and associated large-scale outpourings of nonnormal MORB resulting from these mantle heterogeneities. Siqueiros alkali basalt and MORB, as well as transitional basalt and MORB, were recovered from single dredge hauls. Such close spatial and temporal proximity of the inferred mantle sources places severe constraints on geometric and physicochemical upper mantle models.

An eastern voyage. A journal of the travels of Count Fritz Hochberg through the British empire in the East and Japan.

Mode of access: Internet.

U.S. policy for the East Asia regional economic development program--what should it be? Department of State, Agency for International Development : report to the Congress /

Publication date stamped on cover.

The seed from the East, /

Mode of access: Internet.

History of India from the earliest period to the close of the East India Company's government,

Mode of access: Internet.

Bulgarian horrors, and the question of the East. A letter addressed to the Right Hon. W. E. Gladstone, M. P.,

Mode of access: Internet.

Ceremonies and re-enactment of the one hundredth anniversary of the first inauguration of Abraham Lincoln, 1861-1961, on the east front of the Capitol of the United States, March 4, 1961.

Half title: The one hundredth anniversary of the first inauguration of Abraham Lincoln, 1861-1961; reenactment ceremonies.

Rhymes of the east and recollected verses.

Mode of access: Internet.

Belgium of the East [Egypt]

Ed. i.e. written by Jerrold.

Transplanting of the seagrasses "Zostera Marina" and "Halodule Wrightii" for sediment stabilization and habitat development on the east coast of the United States /

At head of title: Environmental Impact Research Program

The industrial utility of public water supplies in the east North-Central States, 1952,

Mode of access: Internet.