Shoo Fly Complex: Continuing Research on the Most Extensive Belt of Lower Paleozoic Rocks in California

加利福尼亚州内华达山脉北部的ShoFly复合体从结构上最低到结构上最高被细分为(1)朗-霍尔斯特德层序，(2)邓肯峰硅质岩，(3)卡尔伯森湖异地生物和(4)塞拉城混杂岩。北东向的逆冲断层包围了每一个构造切片，而卡尔伯特森湖的地层模式表明，至少部分扇形杂岩形成了在古生代增生杂岩中形成的叠瓦状结构。如果这一假设是正确的，并且可以扩展到包括ShoFly杂岩中的其他单元，那么每个断层有界的切片都包含关于吸积杂岩如何演化的信息。我们将开展一项为期两年的计划，调查整个ShoFly杂岩中的硅质岩单元的年龄(S)，以及朗-霍尔斯特德层序的地层学、岩石学、沉积学和构造特征。这里提出的工作产生的数据将允许对ShoFly复合体的完整横断面部分进行全面的地体分析，并将大大增加我们对加州最广泛的下古生代岩石带的了解。这一结果可能会对北美原住民地壳和外来或可疑地壳元素的分布产生重大影响。

The Shoo Fly Complex, northern Sierra Nevada, California has been subdivided into, from structurally lowest to structurally highest, (1) the Lang-Halsted sequence, (2) the Duncan Peak chert, (3) the Culbertson Lake allochthon and (4) the Sierra City melange. Northeast-dipping thrust faults bound each structural slice, and stratigraphic patterns in the Culbertson Lake allochthon suggest that at least parts of the Shoo Fly Complex form an imbricate structure that formed in a Paleozoic accretionary complex. If this hypothesis is correct and can be expanded to include other units in the Shoo Fly Complex, then each fault-bounded slice contains information about how the accretionary complex evolved. We will undertake a two-year program to investigate the age(s) of chert units throughout the Shoo Fly Complex, and the stratigraphic, petrologic, sedimentologic, and structural characteristics of the Lang- Halsted sequence. Data generated by work proposed here will allow for a comprehensive terrane analysis of a complete cross- sectional portion of the Shoo Fly Complex, and will add significantly to our understanding of the most extensive belt of lower Paleozoic rocks in California. The results could have a major impact on the distribution of aboriginal North American crust and exotic or suspect crustal elements.