Nd isotopic composition of cratonic rocks in the southern Death Valley region: Evidence for a substantial Archean source component in Mojavia
Geology
By: J.P. Calzia
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Abstract
Thirty Early Proterozoic intermediate to silicic metasedimentary and metaigneous rocks in the southern Death Valley region and vicinity show ϵNd values of −1.6 to −6.3 at 1.7 Ga and Nd model ages of 2.1 to 2.6 Ga. These cratonic rocks thus reveal an older signature than so far reported for Nd province 1 of the western United States; as much as 30%–40% of their mass may be Archean crustal material. The Archean component was introduced in the form of sedimentary detritus that was probably subducted and mixed with juvenile material at a convergent margin. Three younger Precambrian rocks associated with the cratonic rocks also have a Nd isotopic composition of province 1 type.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Nd isotopic composition of cratonic rocks in the southern Death Valley region: Evidence for a substantial Archean source component in Mojavia |
| Series title | Geology |
| DOI | 10.1130/0091-7613(1998)026<0891:NICOCR>2.3.CO;2 |
| Volume | 26 |
| Issue | 10 |
| Year Published | 1998 |
| Language | English |
| Publisher | Geological Society of America |
| Description | 4 p. |
| First page | 891 |
| Last page | 894 |