Mean grain size and structure of ODP Hole 140-504B samples

Microstructural investigations of ocean crust samples provide a complementary approach to both marine surveys and laboratory experiments. The recovery of relatively undeformed diabases from Deep Sea Drilling Project (DSDP)/Ocean Drilling Program (ODP) Hole 504B provides a first opportunity to examine a reference section of microstructural features that influence strain localization at depths of 2 km in the ocean crust. Syn- and post-crystallization features in plagioclase and augite crystals have been examined by optical microscopy and secondary and backscattered electron imaging. These features show a strong influence of modal composition and primary textures on early sites of strain localization. Thermal cracking and subsequent alteration intensities and distribution are strongly phase dependent. A consistently higher intragranular fracture density is observed in augite crystals relative to plagioclase. The impact of alteration on the mechanical response of diabases is likely to depend on the primary textural characteristics. Even where extensive augite alteration occurs, the rock remains supported by a framework of weakly altered plagioclase crystals. The Hole 504B diabases from Leg 140 provide a valuable comparison for future studies of more deformed sections likely to be encountered at depth. Advances in constraining the detailed rheology of the ocean crust at spreading centers would benefit from experimental deformation of texturally diverse diabase and gabbro samples.

Palynology on lake sediments from the Pyrenees

A multi-proxy palaeoecological investigation including pollen, plant macrofossil, radiocarbon and sedimentological analyses, was performed on a small mountain lake in the Eastern Pyrenees. This has allowed the reconstruction of: (1) the vegetation history of the area based on five pollen diagrams and eight AMS14C dates and (2) the past lake-level changes, based on plant macrofossil, lithological and pollen analysis of two stratigraphical transects correlated by pollen analysis. The palaeolake may have appeared before the Younger Dryas; the lake-level was low and the vegetation dominated by cold steppic grasslands. The lake-level rose to its highest level during the Holocene in the Middle Atlantic (at ca. 5060±45 b.p.). Postglacial forests (Quercetum mixtum and Abieto-Fagetum) developed progressively in the lower part of the valley, while dense Pinus uncinata forests rapidly invaded the surroundings of the mire and remained the dominant local vegetation until present. The observed lowering of the lake levels during the Late Atlantic and the Subboreal (from 5060 ± B.P. to 3590±40 b.p.) was related to the overgrowth of the mire. The first obvious indications of anthropogenic disturbances of the vegetation are recorded at the Atlantic/Subboreal boundary as a reduction in the forest component, which has accelerated during the last two millennia.

Migratory farmworkers in the midcontinent streams /

Cover title.

1888 University of Michigan Football Team

The language of flowers with illustrative poetry : to which are now first added the calendar of flowers, and the dial of flowers.

Probably based on "Le langage des fleurs" by Mme. Louise Cortambert, who wrote under the pseudonym "Charlotte de Latour."

Ariel,

Mode of access: Internet.

1987 insect pest management guide : home, yard, and garden /

Cover title.

The Beauties of England and Wales; or, Delineations, topographical, historical, and descriptive, of each county.

For full contents note see NUC pre-1956 cited above.

Le premier livre des antiqvitez de Rome : contenant vne generale description de sa grandevr, et comme vne deploration de sa rvine /

No more published.

The late years of Michel Angelo,

"Three hundred copies of this book on Dutch handmade paper privately printed by Frederic Fairchild Sherman."

Incomes of migratory agricultural workers /

Tx Doc no.: Z, TA245.7, B873, no. 950.

British Columbia from the earliest times to the present /

Mode of access: Internet.

Latest contemporary portraits,

"Second printing, April, 1928."