A review of the geologic history of the Himalayan-Tibetan orogen suggests that at least 1400
km of north-south shortening has been absorbed by the orogen since the onset of the Indo-…

… Several critiques of the Watson-Harrison hypothesis have appeared but essentially
reflect two specific arguments: Hadean zircons (a) are potentially sourced from late-stage …

The purposes of this article were to summarize the development of family-centered pediatric
care, review the current state of nursing research in this area, and recommend directions for …

… Harrison and A. Yin are at the Institute ofGeophysics and Planetary Physics and the
Department … McDougall and TM Harrison, Geochronolo and Thrmohronology Using the 4"0Ar/'9Ar …

The long-favored paradigm for the development of continental crust is one of progressive
growth beginning at ∼4 billion years ago (Ga). To test this hypothesis, we measured initial 176 …

Hydrothermal experiments in the temperature range 750–1020C have defined the
saturation behavior of zircon in crustal anatectic melts as a function of both temperature and …

Argon isotopic dating is one of the most important techniques for estimating the ages of rocks
and can be used on very small samples. It has been used to assign reliable ages to the …

IT is unknown when life first appeared on Earth. The earliest known microfossils (3,500 Myr
before present) are structurally complex, and if it is assumed that the associated organisms …

… HARRISON ( 198 1) has shown that evidence for diffusive loss of 40Ar* in hydrothermal … on
their periphery by excess &Ar (HARRISON and McDouGALL, 1980b), such an interpreqtion is …

Ancient zircons from Western Australia's Jack Hills preserve a record of conditions that prevailed
on Earth not long after its formation. Widely considered to have been a uniquely violent …