The phrase "a complex zone of" is correct and usable in written English.
It can be used to describe a multifaceted area or situation that involves various elements or factors, often in academic or analytical contexts.
Example: "The research focused on a complex zone of interactions between social, economic, and environmental factors."
Alternatives: "a complicated area of" or "a multifaceted realm of".
The eastern third of the state is a complex zone of old, eroded highlands, with extensive exposures of granite and mineralized metamorphic rocks, occasionally capped by younger basalt flows, and with broad basins of even more-recent sedimentary rocks.
To the east and southeast, the Dezful Embayment is bounded by a complex zone of faults and flexures having a N S trend (Kazerun-Qatar Falcon (Falcon 1967; Motiei 1995; Alavi 2007).
Iran lies within the complex zone of collision between the Arabian Plate and the Eurasian Plate; near Qeshm the rate of convergence is about 25 millimeters annually.
The quake occurred in a tectonically complex zone dominated by the titanic convergence of the Indian and Eurasian plates.
The Isthmus of Tehuantepec, a geologically complex zone that has undergone continental uplift and sea level oscillation since the late Miocene [ 12, 13], has been considered a major biogeographic barrier [ 14].
Consequently, Macedonia forms a complex border zone between the major cultural traditions of Europe and Asia.
Brown has given much of the credit for the late turnaround to his team's "Freak" Defense, which he describes as a combination of complex zones and man-to-mans that can change in an instant.
Simpson et al. (1981) suggested that this earthquake was associated with the complex zone at the oblique intersection of the Talas-Fergana fault and Chatkal range.
The agreement established a schedule for Israeli withdrawals from the Palestinian population centres (to be implemented in several stages) and created a complex system of zones that were divided between areas fully controlled by the Palestinians, those under Palestinian civil authority but Israeli military control, and those exclusively under Israeli control.
It's also quite a complex set of subduction zones.
The basal failure surface was most likely not composed of a single structure, but of a complex interplay of fault zones, metamorphic foliation, joints and broken rock bridges.
