WRAY, DAVID S. (1999) Identification and long-range correlation of bentonites in Turonian–Coniacian (Upper Cretaceous) chalks of northwest Europe. Geological Magazine, 136 (4) 361-371 doi:10.1017/s0016756899002836
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Identification and long-range correlation of bentonites in Turonian–Coniacian (Upper Cretaceous) chalks of northwest Europe | ||
| Journal | Geological Magazine | ||
| Authors | WRAY, DAVID S. | Author | |
| Year | 1999 (July) | Volume | 136 |
| Issue | 4 | ||
| Publisher | Cambridge University Press (CUP) | ||
| DOI | doi:10.1017/s0016756899002836Search in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 258164 | Long-form Identifier | mindat:1:5:258164:8 |
| GUID | 0 | ||
| Full Reference | WRAY, DAVID S. (1999) Identification and long-range correlation of bentonites in Turonian–Coniacian (Upper Cretaceous) chalks of northwest Europe. Geological Magazine, 136 (4) 361-371 doi:10.1017/s0016756899002836 | ||
| Plain Text | WRAY, DAVID S. (1999) Identification and long-range correlation of bentonites in Turonian–Coniacian (Upper Cretaceous) chalks of northwest Europe. Geological Magazine, 136 (4) 361-371 doi:10.1017/s0016756899002836 | ||
| In | (1999, July) Geological Magazine Vol. 136 (4) Cambridge University Press (CUP) | ||
| Abstract/Notes | A geochemical and mineralogical study of thin (2–20 cm) clay-rich beds found in Turonian–Coniacian chalks from the Anglo-Paris Basin has been undertaken. On the basis of their rare-earth element (REE) and mineralogical composition it is possible to subdivide beds into bentonites, characterized by a negative Eu anomaly and elevated smectite content, and detrital beds (characterized by a minimal or absent Eu anomaly and a greater proportion of illite). Six beds are considered to be bentonites (Glynde 1, Southerham 1, Caburn, Bridgewick 1, Lewes and Shoreham 2). Trace-element discriminant diagrams add support, as does comparison with similar studies undertaken in eastern England and northern Germany. Geochemical evidence demonstrates that the tephra was variably acidic in composition (rhyodacite–rhyolite–comendite/pantellerite), and was probably derived from crustal melting associated with initial rifting of the North Atlantic. Correlation of bentonites between the Anglo-Paris Basin, eastern England and northern Germany can be demonstrated and independently tested, establishing a tephro-event stratigraphy across northwest Europe for this period. | ||
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