Petrographical and geochemical evidences for paragenetic sequence interpretation of diagenesis in mixed siliciclastic–carbonate sediments: Mozduran Formation (Upper Jurassic), south of Agh-Darband, NE Iran

The Upper Jurassic Mozduran Formation with a thickness of 420 m at the type locality is the most important gas-bearing reservoir in NE Iran. It is mainly composed of limestone, dolostone with shale and gypsum interbeds that grade into coarser siliciclastics in the easternmost part of the basin. Eight stratigraphic sections were studied in detail in south of the Agh-Darband area. These analyses suggest that four carbonate facies associations and three siliciclastic lithofacies were deposited in shallow marine to shoreline environments, respectively. Cementation, compaction, dissolution, micritization, neomorphism, hematitization, dolomitization and fracturing are diagenetic processes that affected these sediments.Stable isotope variations of δ18O and δ13C in carbonate rocks show two different trends. High depletion of δ18O and low variation of δ13C probably reflect increasing temperatures during burial diagenesis, while the higher depletion in carbon isotope values with low variations in oxygen isotopes are related to fresh water flushing during meteoric diagenesis. Negative values of carbon isotopes may have also resulted from organic matter alteration during penetration of meteoric water. Fe and Mn enrichment with depletion of δ18O also supports the contention that alteration associated with higher depletion in carbon isotope values with low variations in oxygen isotopes took place during meteoric diagenesis. The presence of bright luminescence indicates redox conditions during precipitation of calcite cement

The problem and promise of coproduction: Politics, history, and autonomy

Interest in coproduction has continued to grow since Elinor Ostrom introduced the concept to the development scholarship two decades ago. The idea that multiple actors often interact to coproduce public goods and services helped shift development thinking away from one-size-fits-all policy prescriptions based on free market principles to a more nuanced position that recognizes organizational and institutional diversity. However, while Ostrom’s concept of coproduction provides a useful starting point to think about how states and societies interact to deliver public goods and services, it fails to capture the complexity and significance of the process. The diverse scholarship that has extended and critiqued her work has provided a fuller picture. Yet, important gaps remain. The principal aim of this article is to fill some of these gaps and expand the boundaries of coproduction research and analysis. Drawing on qualitative research on water services and management in Ecuador, it focuses on two interrelated issues that are overlooked or underdeveloped in the existing literature. The first relates to the history of coproduction. The article shows that coproduction is more deeply rooted in capitalist development than commonly believed, and historical events have a significant bearing on contemporary politics. The second concerns autonomy. The essay shows that coproduction simultaneously promotes engagement with and autonomy from the state, and that this tension generates political struggle and change. More broadly, the article casts fresh light on the politics of public goods and services in the Global South, especially on the political impact of collective social participation in the process