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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 91 records · Page 5
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NASA NTRS1973

Observations of Taurus X-1 by the 1-60 keV X-ray detector on the OSO-7.

The seventh Orbiting Solar Observatory, OSO-7, carries an X-ray detector for measuring the positions, spectra, and time variations of X-ray sources in the energy range from 1 to 60 keV. The instrument has operated successfully since the launch on 1971 September 29. The purpose of this paper is to describe the instrument and to report a measurement of the spectrum of Tau X-1 based on data covering the widest energy range that has so far been observed in a single experiment.

Clark, G. W.↗
NASA NTRS1973

Small structures of the Taurus-Littrow region

Apollo 17 photographs of small structures expressed as scarps, ledges, flow fronts, and mare type ridges are compared in an effort to determine the origin of such structures. The resulting data revealed that these structures were probably developed as lava extrusions from fractures and fissures along with associated faulting and folding.

Scott, D. H.↗
NASA NTRS1973

Geologic exploration of Taurus-Littrow - Apollo 17 landing site

Apollo 17 landed in a deep graben valley embaying the mountainous highlands southeast of the Serenitatis basin. Impact-generated breccias underlie the massifs adjacent to the valley, and basalt has flooded and leveled the valley floor. The dark mantle inferred from orbital photographs was not recognized as a discrete unit; the unusually thick regolith of the valley floor contains a unique high concentration of dark glass beads that may cause the low albedo of much of the surface.

Source record↗
NASA NTRS1974

U-Th-Pb and Rb-Sr systematics of Apollo 17 boulder 7 from the North Massif of the Taurus-Littrow valley

Portions of highland breccia boulder 7 collected during the Apollo 17 mission were studied using U-Th-Pb and Rb-Sr systematics. A Rb-Sr internal isochron age of 3.89 plus or minus 0.08 b.y. with an initial Sr-87/Sr-86 of 0.69926 plus or minus 0.00008 was obtained for clast 1 (77135,57) (a troctolitic microbreccia). A troctolitic portion of microbreccia clast 77215,37 yielded a U-Pb internal isochron of 3.8 plus or minus 0.2 b.y. and an initial Pb-206/Pb-207 of 0.69. These internal isochron ages are interpreted as reflecting metamorphic events, probably related to impacts, which reset Rb-Sr and U-Pb mineral systems of older rocks.

Nunes, P. D.↗
NASA NTRS1974

Petrology of a stratified boulder from South Massif, Taurus-Littrow

Boulder 1 from Station 2 at the foot of South Massif is unique in being the only stratified boulder sampled by the Apollo 17 astronauts. Our studies of two of the four specimens that were collected from separate layers show that the boulder is composed of glass-poor, fragment-rich breccias which are aggregates of differentially annealed terra material, mainly ANT, but including basaltic troctolite, pigeonite basalt, granitic particles, dark breccia-rimmed anorthositic clasts, and a KREEPless norite that has not been recognized elsewhere at the Apollo 17 site. The boulder appears to derive from the uppermost blue-gray layer on South Massif, which we believe consists of ejecta deposited from a single large impact event (possibly the one which excavated the Serenitatis Basin).

Stoeser, D. B.↗
NASA NTRS1974

Mare basalts from the Taurus-Littrow region of the moon

Two distinct chemical basalt types have been sampled at the Apollo 17 landing site. Very high-titanium basalts (about 13 wt % TiO2) are the dominant type and display a textural range from olivine-porphyritic, ilmenite vitrophyres to plagioclase-poikilitic, ilmenite microgabbros. Most of these rocks could have come from one flow. These basalts appear to represent partial melts from feldspar-ilmenite cumulates with an Ar-40/Ar-39 age of about 3.7 G.y., which have experienced little, if any, near-surface fractionation of olivine and Fe-Mg-Ti oxides. A second type of basalt virtually identical to the Apollo 11 (low-K) basalts is much less common.

Papike, J. J.↗
NASA NTRS1974

Petrology of the highlands massifs at Taurus-Littrow - An analysis of the 2-4 mm soil fraction

The petrography, phase chemistry, and Ar-40/Ar-39 ages of 2-4 mm fragments from the soils of both mare and highlands stations sampled by Apollo 17 are studied. It is found that the massifs consist of a complex stratigraphy of interlayered noritic breccias of varying metamorphic grades, melt rocks, and anorthositic rocks. A stratigraphic correlation of the lithologies within the North Massif and the South Massif is carried out. The petrogenesis of rock types with respect to thermal and impact history is discussed. The observed spinel cataclasites may represent relatively deep material sampled by the Serenitatis event.

Bence, A. E.↗
NASA NTRS1974

Taurus-Littrow chronology - Some constraints on early lunar crustal development

A number of samples obtained during the Apollo 17 mission give direct evidence of lunar processes occurring more than 4 aeons ago. The significance of Rb-Sr data for the history of the involved materials is discussed and mineral isochrons are presented for an Apollo 17 mare basalt. Data on a number of Apollo 17 soils and on some Apollo 15 and 16 whole-rock samples are also presented.

Nyquist, L. E.↗