Thermal history of the early Miocene Waitemata Basin and adjacent Waipapa Group, North Island, New Zealand

Apatite fission track (AFT) and vitrinite reflectance (VR) data for early Miocene outcrops from the Waitemata Basin reveal that the basin sequence was subjected to shallow burial before denudation. AFT results suggest that the total sediment thickness within the basin was <=1 km and maximum paleotemperatures during burial never exceeded c. 60deg.C. Statistical analyses of the detrital AFT ages distinguish four dominant sources of sediment supply: contemporaneous volcanism; metagreywacke rocks of the Waipapa Group; the Northland Allochthon; and an unidentified source south of the basin. The apatite and zircon fission track results from the Waipapa Group rocks (Gondwana Terrane) adjacent to the basin suggest two discrete phases of accelerated cooling: the first during the early Cretaceous (c. 117 Ma) and the second during the mid Cretaceous (c. 84 Ma). These events probably reflect key stages in the tectonic development of the New Zealand microcontinent during the Cretaceous period, the earlier event being related to the climax of compressional deformation (Rangitata Orogeny) and the latter to extensional tectonism associated with the opening of the Tasman Sea. Waipapa Group rocks now exposed at the surface cooled from maximum paleotemperatures of c. 250deg.C at an estimated rate of c. 180-36deg.C/m.y., involving substantial denudation

Cultural Spillovers: Copyright, Conceptions of Authors, and Commercial Practices

Economists, sociologists, and legal scholars agree that intellectual-property law is fundamental to markets because legal control over copying motivates creative production. But in many markets, such as fashion and databases, there is little or no intellectual-property protection, yet producers still create innovative products and earn profits. Research on such “negative spaces” in intellectual-property law reveals that social norms can constrain copying and support creative production. This insight guided our analysis of markets for American literature before the Civil War, in both magazines (a negative space, where intellectual-property law did not apply) and books (a positive space, where intellectual-property law did apply). We observed similar understandings of authors and similar commercial practices in both spaces because many authors published the same work in both spaces. Based on these observations, we propose that cultural elements that develop in positive spaces may spill over to related negative spaces, inducing changes in buyers' and sellers' behavior in negative spaces. Our historical approach also revealed nuances—shades of gray—beyond the sharp distinction typically drawn between negative and positive spaces. In the 1850s, a few large-circulation magazine publishers began to claim copyright, but many still allowed reprinting and none litigated to protect copyright